diff --git a/.travis.yml b/.travis.yml
index 29e9915..7ce60de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,8 @@ language: php
 
 matrix:
   include:
-    - php: hhvm
     - php: nightly
+    - php: 7.3
     - php: 7.2
     - php: 7.1
     - php: 7.0
@@ -19,11 +19,15 @@ matrix:
   allow_failures:
     - php: nightly
 
-install:
-  - if [[ ! $TRAVIS_PHP_VERSION = hhvm* ]]; then phpenv config-rm xdebug.ini || echo "xdebug not available"; fi
-  - if [[ ! $TRAVIS_PHP_VERSION = hhvm* ]]; then INI_FILE=~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; else INI_FILE=/etc/hhvm/php.ini; fi
+before_install:
+  - phpenv config-rm xdebug.ini || echo "xdebug not available"
+  - INI_FILE=~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - echo date.timezone = Europe/Berlin >> $INI_FILE
   - echo memory_limit = -1 >> $INI_FILE
+
+install:
+  # Use composer update instead of composer install to install a working set of
+  # dependencies on all PHP versions.
   - composer update
 
 script:
diff --git a/Cmfcmf/OpenWeatherMap.php b/Cmfcmf/OpenWeatherMap.php
index 500dfa7..4ff6ccb 100644
--- a/Cmfcmf/OpenWeatherMap.php
+++ b/Cmfcmf/OpenWeatherMap.php
@@ -71,7 +71,7 @@ class OpenWeatherMap
     /**
      * @var string The basic api url to fetch uv index data from.
      */
-    private $uvIndexUrl = 'https://api.openweathermap.org/v3/uvi';
+    private $uvIndexUrl = 'https://api.openweathermap.org/data/2.5/uvi';
 
     /**
      * @var AbstractCache|bool $cache The cache to use.
@@ -315,47 +315,73 @@ public function getWeatherHistory($query, \DateTime $start, $endOrCount = 1, $ty
     /**
      * Returns the current uv index at the location you specified.
      *
-     * @param float              $lat           The location's latitude.
-     * @param float              $lon           The location's longitude.
+     * @param float $lat The location's latitude.
+     * @param float $lon The location's longitude.
      *
      * @throws OpenWeatherMap\Exception  If OpenWeatherMap returns an error.
      * @throws \InvalidArgumentException If an argument error occurs.
      *
-     * @return UVIndex The uvi object.
+     * @return UVIndex
      *
      * @api
      */
     public function getCurrentUVIndex($lat, $lon)
     {
-        $answer = $this->getRawCurrentUVIndexData($lat, $lon);
+        $answer = $this->getRawUVIndexData('current', $lat, $lon);
         $json = $this->parseJson($answer);
 
         return new UVIndex($json);
     }
 
     /**
-     * Returns the uv index at date, time and location you specified.
+     * Returns a forecast of the uv index at the specified location.
+     * The optional $cnt parameter determines the number of days to forecase.
+     * The maximum supported number of days is 8.
      *
-     * @param float              $lat           The location's latitude.
-     * @param float              $lon           The location's longitude.
-     * @param \DateTimeInterface $dateTime      The date and time to request data for.
-     * @param string             $timePrecision This decides about the timespan OWM will look for the uv index. The tighter
-     *                                          the timespan, the less likely it is to get a result. Can be 'year', 'month',
-     *                                          'day', 'hour', 'minute' or 'second', defaults to 'day'.
+     * @param float $lat The location's latitude.
+     * @param float $lon The location's longitude.
+     * @param int   $cnt Number of returned days (default to 8).
      *
      * @throws OpenWeatherMap\Exception  If OpenWeatherMap returns an error.
      * @throws \InvalidArgumentException If an argument error occurs.
      *
-     * @return UVIndex The uvi object.
+     * @return UVIndex[]
      *
      * @api
      */
-    public function getUVIndex($lat, $lon, $dateTime, $timePrecision = 'day')
+    public function getForecastUVIndex($lat, $lon, $cnt = 8)
     {
-        $answer = $this->getRawUVIndexData($lat, $lon, $dateTime, $timePrecision);
-        $json = $this->parseJson($answer);
+        $answer = $this->getRawUVIndexData('forecast', $lat, $lon, $cnt);
+        $data = $this->parseJson($answer);
 
-        return new UVIndex($json);
+        return array_map(function ($entry) {
+            return new UVIndex($entry);
+        }, $data);
+    }
+
+    /**
+     * Returns the historic uv index at the specified location.
+     *
+     * @param float     $lat   The location's latitude.
+     * @param float     $lon   The location's longitude.
+     * @param \DateTime $start Starting point of time period.
+     * @param \DateTime $end   Final point of time period.
+     *
+     * @throws OpenWeatherMap\Exception  If OpenWeatherMap returns an error.
+     * @throws \InvalidArgumentException If an argument error occurs.
+     *
+     * @return UVIndex[]
+     *
+     * @api
+     */
+    public function getHistoricUVIndex($lat, $lon, $start, $end)
+    {
+        $answer = $this->getRawUVIndexData('historic', $lat, $lon, null, $start, $end);
+        $data = $this->parseJson($answer);
+
+        return array_map(function ($entry) {
+            return new UVIndex($entry);
+        }, $data);
     }
 
     /**
@@ -492,55 +518,45 @@ public function getRawWeatherHistory($query, \DateTime $start, $endOrCount = 1,
     }
 
     /**
-     * Directly returns the json string returned by OpenWeatherMap for the current UV index data.
+     * Directly returns the json string returned by OpenWeatherMap for the UV index data.
      *
-     * @param float $lat                   The location's latitude.
-     * @param float $lon                   The location's longitude.
+     * @param string    $mode  The type of requested data (['historic', 'forecast', 'current']).
+     * @param float     $lat   The location's latitude.
+     * @param float     $lon   The location's longitude.
+     * @param int       $cnt   Number of returned days (only allowed for 'forecast' data).
+     * @param \DateTime $start Starting point of time period (only allowed and required for 'historic' data).
+     * @param \DateTime $end   Final point of time period (only allowed and required for 'historic' data).
      *
      * @return bool|string Returns the fetched data.
      *
      * @api
      */
-    public function getRawCurrentUVIndexData($lat, $lon)
+    public function getRawUVIndexData($mode, $lat, $lon, $cnt = null, $start = null, $end = null)
     {
-        if (!$this->apiKey) {
-            throw new \RuntimeException('Before using this method, you must set the api key using ->setApiKey()');
+        if (!in_array($mode, array('current', 'forecast', 'historic'), true)) {
+            throw new \InvalidArgumentException("$mode must be one of 'historic', 'forecast', 'current'.");
         }
         if (!is_float($lat) || !is_float($lon)) {
             throw new \InvalidArgumentException('$lat and $lon must be floating point numbers');
         }
-        $url = $this->buildUVIndexUrl($lat, $lon);
-
-        return $this->cacheOrFetchResult($url);
-    }
-
-    /**
-     * Directly returns the json string returned by OpenWeatherMap for the UV index data.
-     *
-     * @param float $lat                   The location's latitude.
-     * @param float $lon                   The location's longitude.
-     * @param \DateTimeInterface $dateTime The date and time to request data for.
-     * @param string $timePrecision        This decides about the timespan OWM will look for the uv index. The tighter
-     *                                     the timespan, the less likely it is to get a result. Can be 'year', 'month',
-     *                                     'day', 'hour', 'minute' or 'second', defaults to 'day'.
-     *
-     * @return bool|string Returns the fetched data.
-     *
-     * @api
-     */
-    public function getRawUVIndexData($lat, $lon, $dateTime, $timePrecision = 'day')
-    {
-        if (!$this->apiKey) {
-            throw new \RuntimeException('Before using this method, you must set the api key using ->setApiKey()');
+        if (isset($cnt) && (!is_int($cnt) || $cnt > 8 || $cnt < 1)) {
+            throw new \InvalidArgumentException('$cnt must be an int between 1 and 8');
         }
-        if (!is_float($lat) || !is_float($lon)) {
-            throw new \InvalidArgumentException('$lat and $lon must be floating point numbers');
+        if (isset($start) && !$start instanceof \DateTime) {
+            throw new \InvalidArgumentException('$start must be an instance of \DateTime');
+        }
+        if (isset($end) && !$end instanceof \DateTime) {
+            throw new \InvalidArgumentException('$end must be an instance of \DateTime');
         }
-        if (interface_exists('DateTimeInterface') && !$dateTime instanceof \DateTimeInterface || !$dateTime instanceof \DateTime) {
-            throw new \InvalidArgumentException('$dateTime must be an instance of \DateTime or \DateTimeInterface');
+        if ($mode === 'current' && (isset($start) || isset($end) || isset($cnt))) {
+            throw new \InvalidArgumentException('Neither $start, $end, nor $cnt must be set for current data.');
+        } elseif ($mode === 'forecast' && (isset($start) || isset($end) || !isset($cnt))) {
+            throw new \InvalidArgumentException('$cnt needs to be set and both $start and $end must not be set for forecast data.');
+        } elseif ($mode === 'historic' && (!isset($start) || !isset($end) || isset($cnt))) {
+            throw new \InvalidArgumentException('Both $start and $end need to be set and $cnt must not be set for historic data.');
         }
-        $url = $this->buildUVIndexUrl($lat, $lon, $dateTime, $timePrecision);
 
+        $url = $this->buildUVIndexUrl($mode, $lat, $lon, $cnt, $start, $end);
         return $this->cacheOrFetchResult($url);
     }
 
@@ -575,10 +591,12 @@ private function cacheOrFetchResult($url)
             /** @var AbstractCache $cache */
             $cache = $this->cache;
             $cache->setSeconds($this->seconds);
+
             if ($cache->isCached($url)) {
                 $this->wasCached = true;
                 return $cache->getCached($url);
             }
+
             $result = $this->fetcher->fetch($url);
             $cache->setCached($url, $result);
         } else {
@@ -612,47 +630,41 @@ private function buildUrl($query, $units, $lang, $appid, $mode, $url)
     }
 
     /**
-     * @param float                        $lat
-     * @param float                        $lon
-     * @param \DateTime|\DateTimeImmutable $dateTime
-     * @param string                       $timePrecision
+     * @param string             $mode          The type of requested data.
+     * @param float              $lat           The location's latitude.
+     * @param float              $lon           The location's longitude.
+     * @param int                $cnt           Number of returned days.
+     * @param \DateTime          $start         Starting point of time period.
+     * @param \DateTime          $end           Final point of time period.
      *
      * @return string
      */
-    private function buildUVIndexUrl($lat, $lon, $dateTime = null, $timePrecision = null)
+    private function buildUVIndexUrl($mode, $lat, $lon, $cnt = null, \DateTime $start = null, \DateTime $end = null)
     {
-        if ($dateTime !== null) {
-            $format = '\Z';
-            switch ($timePrecision) {
-                /** @noinspection PhpMissingBreakStatementInspection */
-                case 'second':
-                    $format = ':s' . $format;
-                /** @noinspection PhpMissingBreakStatementInspection */
-                case 'minute':
-                    $format = ':i' . $format;
-                /** @noinspection PhpMissingBreakStatementInspection */
-                case 'hour':
-                    $format = '\TH' . $format;
-                /** @noinspection PhpMissingBreakStatementInspection */
-                case 'day':
-                    $format = '-d' . $format;
-                /** @noinspection PhpMissingBreakStatementInspection */
-                case 'month':
-                    $format = '-m' . $format;
-                case 'year':
-                    $format = 'Y' . $format;
-                    break;
-                default:
-                    throw new \InvalidArgumentException('$timePrecision is invalid.');
-            }
-            // OWM only accepts UTC timezones.
-            $dateTime->setTimezone(new \DateTimeZone('UTC'));
-            $dateTime = $dateTime->format($format);
-        } else {
-            $dateTime = 'current';
+        $params = array(
+            'appid' => $this->apiKey,
+            'lat' => $lat,
+            'lon' => $lon,
+        );
+
+        switch ($mode) {
+            case 'historic':
+                $requestMode = '/history';
+                $params['start'] = $start->format('U');
+                $params['end'] = $end->format('U');
+                break;
+            case 'forecast':
+                $requestMode = '/forecast';
+                $params['cnt'] = $cnt;
+                break;
+            case 'current':
+                $requestMode = '';
+                break;
+            default:
+                throw new \InvalidArgumentException("Invalid mode $mode for uv index url");
         }
 
-        return sprintf($this->uvIndexUrl . '/%s,%s/%s.json?appid=%s', $lat, $lon, $dateTime, $this->apiKey);
+        return sprintf($this->uvIndexUrl . '%s?%s', $requestMode, http_build_query($params));
     }
 
     /**
@@ -718,7 +730,8 @@ private function parseJson($answer)
     {
         $json = json_decode($answer);
         if (json_last_error() !== JSON_ERROR_NONE) {
-            throw new OWMException('OpenWeatherMap returned an invalid json object. JSON error was: ' . $this->json_last_error_msg());
+            throw new OWMException('OpenWeatherMap returned an invalid json object. JSON error was: "' .
+                $this->json_last_error_msg() . '". The retrieved json was: ' . $answer);
         }
         if (isset($json->message)) {
             throw new OWMException('An error occurred: '. $json->message);
diff --git a/Cmfcmf/OpenWeatherMap/UVIndex.php b/Cmfcmf/OpenWeatherMap/UVIndex.php
index b89d109..928bd17 100644
--- a/Cmfcmf/OpenWeatherMap/UVIndex.php
+++ b/Cmfcmf/OpenWeatherMap/UVIndex.php
@@ -49,8 +49,8 @@ class UVIndex
     public function __construct($data)
     {
         $utctz = new \DateTimeZone('UTC');
-        $this->time = new \DateTime($data->time, $utctz);
-        $this->location = new Location($data->location->latitude, $data->location->longitude);
-        $this->uvIndex = (float)$data->data;
+        $this->time = new \DateTime($data->date_iso, $utctz);
+        $this->location = new Location($data->lat, $data->lon);
+        $this->uvIndex = (float)$data->value;
     }
 }
diff --git a/Examples/UVIndex.php b/Examples/UVIndex.php
new file mode 100644
index 0000000..6f0d507
--- /dev/null
+++ b/Examples/UVIndex.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * OpenWeatherMap-PHP-API — A php api to parse weather data from http://www.OpenWeatherMap.org .
+ *
+ * @license MIT
+ *
+ * Please see the LICENSE file distributed with this source code for further
+ * information regarding copyright and licensing.
+ *
+ * Please visit the following links to read about the usage policies and the license of
+ * OpenWeatherMap before using this class:
+ *
+ * @see http://www.OpenWeatherMap.org
+ * @see http://www.OpenWeatherMap.org/terms
+ * @see http://openweathermap.org/appid
+ */
+use Cmfcmf\OpenWeatherMap;
+use Cmfcmf\OpenWeatherMap\Exception as OWMException;
+
+require_once __DIR__ . '/bootstrap.php';
+
+$cli = false;
+$lf = '<br>';
+if (php_sapi_name() === 'cli') {
+    $lf = "\n";
+    $cli = true;
+}
+
+// Language of data (try your own language here!):
+$lang = 'de';
+
+// Units (can be 'metric' or 'imperial' [default]):
+$units = 'metric';
+
+// Get OpenWeatherMap object. Don't use caching (take a look into Example_Cache.php to see how it works).
+$owm = new OpenWeatherMap();
+$owm->setApiKey($myApiKey);
+
+// Example 1: Get current uv index in Berlin.
+$uvIndex = $owm->getCurrentUVIndex(52.520008, 13.404954);
+echo "EXAMPLE 1$lf";
+
+echo "Current uv index: $uvIndex->uvIndex";
+echo $lf;
+
+// Example 2: Get uv index forecast in Berlin.
+$forecast = $owm->getForecastUVIndex(52.520008, 13.404954);
+echo "EXAMPLE 2$lf";
+
+foreach ($forecast as $day) {
+    echo "{$day->time->format('r')} will have an uv index of: $day->uvIndex";
+    echo $lf;
+}
+
+
+// Example 3: Get historic uv index in Berlin.
+$history = $owm->getHistoricUVIndex(52.520008, 13.404954, new DateTime('-4month'), new DateTime('-3month'));
+echo "EXAMPLE 3$lf";
+
+foreach ($history as $day) {
+    echo "{$day->time->format('r')} had an uv index of: $day->uvIndex";
+    echo $lf;
+}
diff --git a/tests/Exceptions/OpenWeatherMapExceptionTest.php b/tests/Exceptions/OpenWeatherMapExceptionTest.php
index cb195bd..f17ce91 100644
--- a/tests/Exceptions/OpenWeatherMapExceptionTest.php
+++ b/tests/Exceptions/OpenWeatherMapExceptionTest.php
@@ -121,36 +121,9 @@ public function testGetRawWeatherHistoryWithEndDateException()
      * @expectedException \InvalidArgumentException
      * @dataProvider      uvIndexExceptionDataProvider
      */
-    public function testGetRawUVIndexWithQueryErrorException($lat, $lon, $dateTime, $precision)
+    public function testGetRawUVIndexWithQueryErrorException($mode, $lat, $lon, $cnt, $start, $end)
     {
-        $this->owm->getRawUVIndexData($lat, $lon, $dateTime, $precision);
-    }
-
-    /**
-     * @expectedException \InvalidArgumentException
-     * @dataProvider      currentUVIndexExceptionDataProvider
-     */
-    public function testGetRawCurrentUVIndexWithQueryErrorException($lat, $lon)
-    {
-        $this->owm->getRawCurrentUVIndexData($lat, $lon);
-    }
-
-    /**
-     * @expectedException \RuntimeException
-     */
-    public function testGetRawUVIndexWithoutApiKey()
-    {
-        $this->owm->setApiKey(null);
-        $this->owm->getRawUVIndexData(1.1, 1.1, new \DateTime());
-    }
-
-    /**
-     * @expectedException \RuntimeException
-     */
-    public function testGetRawCurrentUVIndexWithoutApiKey()
-    {
-        $this->owm->setApiKey(null);
-        $this->owm->getRawCurrentUVIndexData(1.1, 1.1);
+        $this->owm->getRawUVIndexData($mode, $lat, $lon, $cnt, $start, $end);
     }
 
     /**
@@ -198,22 +171,20 @@ public function testParseJsonException()
         $method->invoke($this->owm, $answer);
     }
 
+    /**
+     * @expectedException \Cmfcmf\OpenWeatherMap\Exception
+     */
     public function uvIndexExceptionDataProvider()
     {
         return array(
-            array('error-query-format', 'foo', new \DateTime(), 'year'),
-            array(5.4, 1.2, 'foo', 'month'),
-            array(5.4, 12, 'foo', 'day'),
-            array(5.4, 1.2, 'foo', 'bar'),
-        );
-    }
-
-    public function currentUVIndexExceptionDataProvider()
-    {
-        return array(
-            array('error-query-format', 'foo'),
-            array(5.4, 12),
-            array(5.4, '1.2'),
+            array('current', 5.4, 1, 5, null, null),
+            array('forecast', 5.4, 1.2, '5', null, null),
+            array('forecast', 5.4, 1.2, 0, null, null),
+            array('forecast', 5.4, 1.2, 9, null, null),
+            array('forecast', 5.4, 1.2, 5, new \DateTime(), new \DateTime()),
+            array('forecast', 5.4, 12.0, null, '2000-1-1', null),
+            array('historic', 5.4, 1.2, null, new \DateTime(), '2000-1-1'),
+            array('historic', 5.4, 1.2, 5, new \DateTime(), new \DateTime()),
         );
     }
 }
diff --git a/tests/OpenWeatherMapTest.php b/tests/OpenWeatherMapTest.php
index 6a27acc..ee67c18 100644
--- a/tests/OpenWeatherMapTest.php
+++ b/tests/OpenWeatherMapTest.php
@@ -138,19 +138,32 @@ public function testGetCurrentUVIndex()
         $this->assertInstanceOf('\Cmfcmf\OpenWeatherMap\UVIndex', $result);
     }
 
-    public function testGetUVIndex()
+    public function testGetForecastUVIndex()
     {
         $owm = $this->openWeather;
-        $precisions = array('year', 'month', 'day', 'hour', 'minute', 'second');
-        foreach ($precisions as $precision) {
-            try {
-                $result = $owm->getUVIndex(40.7, -74.2, new \DateTime(), $precision);
-            } catch (Exception $e) {
-                // OWM might not actually have data for the timespan.
-                $this->assertSame('An error occurred: not found', $e->getMessage());
-            }
-            $this->assertInstanceOf('\Cmfcmf\OpenWeatherMap\UVIndex', $result);
+        
+        try {
+            $result = $owm->getForecastUVIndex(40.7, -74.2, 5);
+        } catch (Exception $e) {
+            // OWM might not actually have data for the timespan.
+            $this->assertSame('An error occurred: not found', $e->getMessage());
+        }
+        $this->assertContainsOnlyInstancesOf('\Cmfcmf\OpenWeatherMap\UVIndex', $result);
+    }
+
+    public function testGetHistoryUVIndex()
+    {
+        $owm = $this->openWeather;
+
+        try {
+            $start = new \DateTime('1969-08-15');
+            $end = new \DateTime('1969-08-18');
+            $result = $owm->getHistoricUVIndex(40.7, -74.2, $start, $end);
+        } catch (Exception $e) {
+            // OWM might not actually have data for the timespan.
+            $this->assertSame('An error occurred: not found', $e->getMessage());
         }
+        $this->assertContainsOnlyInstancesOf('\Cmfcmf\OpenWeatherMap\UVIndex', $result);
     }
 
     public function testGetDailyWeatherForecast()