diff --git a/.coveragerc b/.coveragerc
index f609b5cb053..1a8d8efc4ec 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -594,7 +594,6 @@ omit =
     homeassistant/components/sensor/worldtidesinfo.py
     homeassistant/components/sensor/worxlandroid.py
     homeassistant/components/sensor/xbox_live.py
-    homeassistant/components/sensor/yweather.py
     homeassistant/components/sensor/zamg.py
     homeassistant/components/shiftr.py
     homeassistant/components/spc.py
diff --git a/homeassistant/components/sensor/yweather.py b/homeassistant/components/sensor/yweather.py
index 873e27975db..846b221d5e3 100644
--- a/homeassistant/components/sensor/yweather.py
+++ b/homeassistant/components/sensor/yweather.py
@@ -160,13 +160,15 @@ class YahooWeatherSensor(Entity):
             self._code = self._data.yahoo.Forecast[self._forecast]['code']
             self._state = self._data.yahoo.Forecast[self._forecast]['high']
         elif self._type == 'wind_speed':
-            self._state = self._data.yahoo.Wind['speed']
+            self._state = round(float(self._data.yahoo.Wind['speed'])/1.61, 2)
         elif self._type == 'humidity':
             self._state = self._data.yahoo.Atmosphere['humidity']
         elif self._type == 'pressure':
-            self._state = self._data.yahoo.Atmosphere['pressure']
+            self._state = round(
+                float(self._data.yahoo.Atmosphere['pressure'])/33.8637526, 2)
         elif self._type == 'visibility':
-            self._state = self._data.yahoo.Atmosphere['visibility']
+            self._state = round(
+                float(self._data.yahoo.Atmosphere['visibility'])/1.61, 2)
 
 
 class YahooWeatherData(object):
diff --git a/tests/components/sensor/test_yweather.py b/tests/components/sensor/test_yweather.py
new file mode 100644
index 00000000000..88b94906a35
--- /dev/null
+++ b/tests/components/sensor/test_yweather.py
@@ -0,0 +1,247 @@
+"""The tests for the Yahoo weather sensor component."""
+import json
+
+import unittest
+from unittest.mock import patch
+
+from homeassistant.setup import setup_component
+
+from tests.common import (get_test_home_assistant, load_fixture,
+                          MockDependency)
+
+VALID_CONFIG_MINIMAL = {
+    'sensor': {
+        'platform': 'yweather',
+        'monitored_conditions': [
+            'weather',
+            ],
+    }
+}
+
+VALID_CONFIG_ALL = {
+    'sensor': {
+        'platform': 'yweather',
+        'monitored_conditions': [
+            'weather',
+            'weather_current',
+            'temperature',
+            'temp_min',
+            'temp_max',
+            'wind_speed',
+            'pressure',
+            'visibility',
+            'humidity',
+        ],
+    }
+}
+
+BAD_CONF_RAW = {
+    'sensor': {
+        'platform': 'yweather',
+        'woeid': '12345',
+        'monitored_conditions': [
+            'weather',
+        ],
+    }
+}
+
+BAD_CONF_DATA = {
+    'sensor': {
+        'platform': 'yweather',
+        'woeid': '111',
+        'monitored_conditions': [
+            'weather',
+        ],
+    }
+}
+
+
+def _yql_queryMock(yql):  # pylint: disable=invalid-name
+    """Mock yahoo query language query."""
+    return ('{"query": {"count": 1, "created": "2017-11-17T13:40:47Z", '
+            '"lang": "en-US", "results": {"place": {"woeid": "23511632"}}}}')
+
+
+def get_woeidMock(lat, lon):  # pylint: disable=invalid-name
+    """Mock get woeid Where On Earth Identifiers."""
+    return '23511632'
+
+
+def get_woeidNoneMock(lat, lon):  # pylint: disable=invalid-name
+    """Mock get woeid Where On Earth Identifiers."""
+    return None
+
+
+class YahooWeatherMock():
+    """Mock class for the YahooWeather object."""
+
+    def __init__(self, woeid, temp_unit):
+        """Initialize Telnet object."""
+        self.woeid = woeid
+        self.temp_unit = temp_unit
+        self._data = json.loads(load_fixture('yahooweather.json'))
+
+    # pylint: disable=no-self-use
+    def updateWeather(self):  # pylint: disable=invalid-name
+        """Return sample values."""
+        return True
+
+    @property
+    def RawData(self):  # pylint: disable=invalid-name
+        """Raw Data."""
+        if self.woeid == '12345':
+            return json.loads('[]')
+        return self._data
+
+    @property
+    def Units(self):  # pylint: disable=invalid-name
+        """Return dict with units."""
+        return self._data['query']['results']['channel']['units']
+
+    @property
+    def Now(self):  # pylint: disable=invalid-name
+        """Current weather data."""
+        if self.woeid == '111':
+            raise ValueError
+        return self._data['query']['results']['channel']['item']['condition']
+
+    @property
+    def Atmosphere(self):  # pylint: disable=invalid-name
+        """Atmosphere weather data."""
+        return self._data['query']['results']['channel']['atmosphere']
+
+    @property
+    def Wind(self):  # pylint: disable=invalid-name
+        """Wind weather data."""
+        return self._data['query']['results']['channel']['wind']
+
+    @property
+    def Forecast(self):  # pylint: disable=invalid-name
+        """Forecast data 0-5 Days."""
+        return self._data['query']['results']['channel']['item']['forecast']
+
+    def getWeatherImage(self, code):  # pylint: disable=invalid-name
+        """Create a link to weather image from yahoo code."""
+        return "https://l.yimg.com/a/i/us/we/52/{}.gif".format(code)
+
+
+class TestWeather(unittest.TestCase):
+    """Test the Yahoo weather component."""
+
+    def setUp(self):
+        """Setup things to be run when tests are started."""
+        self.hass = get_test_home_assistant()
+
+    def tearDown(self):
+        """Stop down everything that was started."""
+        self.hass.stop()
+
+    @MockDependency('yahooweather')
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    def test_setup_minimal(self, mock_yahooweather):
+        """Test for minimal weather sensor config."""
+        assert setup_component(self.hass, 'sensor', VALID_CONFIG_MINIMAL)
+
+        state = self.hass.states.get('sensor.yweather_condition')
+        assert state is not None
+
+        assert state.state == 'Mostly Cloudy'
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Condition')
+
+    @MockDependency('yahooweather')
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    def test_setup_all(self, mock_yahooweather):
+        """Test for all weather data attributes."""
+        assert setup_component(self.hass, 'sensor', VALID_CONFIG_ALL)
+
+        state = self.hass.states.get('sensor.yweather_condition')
+        assert state is not None
+        self.assertEqual(state.state, 'Mostly Cloudy')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Condition')
+
+        state = self.hass.states.get('sensor.yweather_current')
+        assert state is not None
+        self.assertEqual(state.state, 'Cloudy')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Current')
+
+        state = self.hass.states.get('sensor.yweather_temperature')
+        assert state is not None
+        self.assertEqual(state.state, '18')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Temperature')
+
+        state = self.hass.states.get('sensor.yweather_temperature_max')
+        assert state is not None
+        self.assertEqual(state.state, '23')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Temperature max')
+
+        state = self.hass.states.get('sensor.yweather_temperature_min')
+        assert state is not None
+        self.assertEqual(state.state, '16')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Temperature min')
+
+        state = self.hass.states.get('sensor.yweather_wind_speed')
+        assert state is not None
+        self.assertEqual(state.state, '3.94')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Wind speed')
+
+        state = self.hass.states.get('sensor.yweather_pressure')
+        assert state is not None
+        self.assertEqual(state.state, '1000.0')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Pressure')
+
+        state = self.hass.states.get('sensor.yweather_visibility')
+        assert state is not None
+        self.assertEqual(state.state, '14.23')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Visibility')
+
+        state = self.hass.states.get('sensor.yweather_humidity')
+        assert state is not None
+        self.assertEqual(state.state, '71')
+        self.assertEqual(state.attributes.get('friendly_name'),
+                         'Yweather Humidity')
+
+    @MockDependency('yahooweather')
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidNoneMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    def test_setup_bad_woied(self, mock_yahooweather):
+        """Test for bad woeid."""
+        assert setup_component(self.hass, 'sensor', VALID_CONFIG_MINIMAL)
+
+        state = self.hass.states.get('sensor.yweather_condition')
+        assert state is None
+
+    @MockDependency('yahooweather')
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    def test_setup_bad_raw(self, mock_yahooweather):
+        """Test for bad RawData."""
+        assert setup_component(self.hass, 'sensor', BAD_CONF_RAW)
+
+        state = self.hass.states.get('sensor.yweather_condition')
+        assert state is not None
+
+    @MockDependency('yahooweather')
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    def test_setup_bad_data(self, mock_yahooweather):
+        """Test for bad data."""
+        assert setup_component(self.hass, 'sensor', BAD_CONF_DATA)
+
+        state = self.hass.states.get('sensor.yweather_condition')
+        assert state is None
diff --git a/tests/fixtures/yahooweather.json b/tests/fixtures/yahooweather.json
new file mode 100644
index 00000000000..f6ab2980618
--- /dev/null
+++ b/tests/fixtures/yahooweather.json
@@ -0,0 +1,138 @@
+{
+  "query": {
+    "count": 1,
+    "created": "2017-11-17T13:40:47Z",
+    "lang": "en-US",
+    "results": {
+      "channel": {
+        "units": {
+          "distance": "km",
+          "pressure": "mb",
+          "speed": "km/h",
+          "temperature": "C"
+        },
+        "title": "Yahoo! Weather - San Diego, CA, US",
+        "link": "http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/",
+        "description": "Yahoo! Weather for San Diego, CA, US",
+        "language": "en-us",
+        "lastBuildDate": "Fri, 17 Nov 2017 05:40 AM PST",
+        "ttl": "60",
+        "location": {
+          "city": "San Diego",
+          "country": "United States",
+          "region": " CA"
+        },
+        "wind": {
+          "chill": "56",
+          "direction": "0",
+          "speed": "6.34"
+        },
+        "atmosphere": {
+          "humidity": "71",
+          "pressure": "33863.75",
+          "rising": "0",
+          "visibility": "22.91"
+        },
+        "astronomy": {
+          "sunrise": "6:21 am",
+          "sunset": "4:47 pm"
+        },
+        "image": {
+          "title": "Yahoo! Weather",
+          "width": "142",
+          "height": "18",
+          "link": "http://weather.yahoo.com",
+          "url": "http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif"
+        },
+        "item": {
+          "title": "Conditions for San Diego, CA, US at 05:00 AM PST",
+          "lat": "32.878101",
+          "long": "-117.23497",
+          "link": "http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/",
+          "pubDate": "Fri, 17 Nov 2017 05:00 AM PST",
+          "condition": {
+            "code": "26",
+            "date": "Fri, 17 Nov 2017 05:00 AM PST",
+            "temp": "18",
+            "text": "Cloudy"
+          },
+          "forecast": [{
+            "code": "28",
+            "date": "17 Nov 2017",
+            "day": "Fri",
+            "high": "23",
+            "low": "16",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "30",
+            "date": "18 Nov 2017",
+            "day": "Sat",
+            "high": "22",
+            "low": "13",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "30",
+            "date": "19 Nov 2017",
+            "day": "Sun",
+            "high": "22",
+            "low": "12",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "28",
+            "date": "20 Nov 2017",
+            "day": "Mon",
+            "high": "21",
+            "low": "11",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "28",
+            "date": "21 Nov 2017",
+            "day": "Tue",
+            "high": "24",
+            "low": "14",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "30",
+            "date": "22 Nov 2017",
+            "day": "Wed",
+            "high": "27",
+            "low": "15",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "34",
+            "date": "23 Nov 2017",
+            "day": "Thu",
+            "high": "27",
+            "low": "15",
+            "text": "Mostly Sunny"
+          }, {
+            "code": "30",
+            "date": "24 Nov 2017",
+            "day": "Fri",
+            "high": "23",
+            "low": "16",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "30",
+            "date": "25 Nov 2017",
+            "day": "Sat",
+            "high": "22",
+            "low": "15",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "28",
+            "date": "26 Nov 2017",
+            "day": "Sun",
+            "high": "24",
+            "low": "13",
+            "text": "Mostly Cloudy"
+          }],
+          "description": "<![CDATA[<img src=\"http://l.yimg.com/a/i/us/we/52/26.gif\"/>\n<BR />\n<b>Current Conditions:</b>\n<BR />Cloudy\n<BR />\n<BR />\n<b>Forecast:</b>\n<BR /> Fri - Mostly Cloudy. High: 23Low: 16\n<BR /> Sat - Partly Cloudy. High: 22Low: 13\n<BR /> Sun - Partly Cloudy. High: 22Low: 12\n<BR /> Mon - Mostly Cloudy. High: 21Low: 11\n<BR /> Tue - Mostly Cloudy. High: 24Low: 14\n<BR />\n<BR />\n<a href=\"http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/\">Full Forecast at Yahoo! Weather</a>\n<BR />\n<BR />\n<BR />\n]]>",
+          "guid": {
+            "isPermaLink": "false"
+          }
+        }
+      }
+    }
+  }
+}