diff --git a/homeassistant/components/sensor/darksky.py b/homeassistant/components/sensor/darksky.py
index a10a276bf0f..39a258c5e6a 100644
--- a/homeassistant/components/sensor/darksky.py
+++ b/homeassistant/components/sensor/darksky.py
@@ -14,7 +14,7 @@ from requests.exceptions import ConnectionError as ConnectError, \
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
     CONF_API_KEY, CONF_NAME, CONF_MONITORED_CONDITIONS, ATTR_ATTRIBUTION,
-    CONF_LATITUDE, CONF_LONGITUDE)
+    CONF_LATITUDE, CONF_LONGITUDE, UNIT_UV_INDEX)
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
 import homeassistant.helpers.config_validation as cv
@@ -62,7 +62,7 @@ SENSOR_TYPES = {
     'apparent_temperature': ['Apparent Temperature',
                              '°C', '°F', '°C', '°C', '°C', 'mdi:thermometer',
                              ['currently', 'hourly']],
-    'dew_point': ['Dew point', '°C', '°F', '°C', '°C', '°C',
+    'dew_point': ['Dew Point', '°C', '°F', '°C', '°C', '°C',
                   'mdi:thermometer', ['currently', 'hourly', 'daily']],
     'wind_speed': ['Wind Speed', 'm/s', 'mph', 'km/h', 'mph', 'mph',
                    'mdi:weather-windy', ['currently', 'hourly', 'daily']],
@@ -96,6 +96,10 @@ SENSOR_TYPES = {
     'precip_intensity_max': ['Daily Max Precip Intensity',
                              'mm', 'in', 'mm', 'mm', 'mm', 'mdi:thermometer',
                              ['currently', 'hourly', 'daily']],
+    'uv_index': ['UV Index',
+                 UNIT_UV_INDEX, UNIT_UV_INDEX, UNIT_UV_INDEX,
+                 UNIT_UV_INDEX, UNIT_UV_INDEX, 'mdi:weather-sunny',
+                 ['currently', 'hourly', 'daily']],
 }
 
 CONDITION_PICTURES = {
@@ -305,7 +309,7 @@ class DarkSkySensor(Entity):
                             'temperature_min', 'temperature_max',
                             'apparent_temperature_min',
                             'apparent_temperature_max',
-                            'pressure', 'ozone']):
+                            'pressure', 'ozone', 'uvIndex']):
             return round(state, 1)
         return state
 
diff --git a/homeassistant/components/sensor/isy994.py b/homeassistant/components/sensor/isy994.py
index 57995a831f3..f64fa6191e2 100644
--- a/homeassistant/components/sensor/isy994.py
+++ b/homeassistant/components/sensor/isy994.py
@@ -9,7 +9,7 @@ from typing import Callable  # noqa
 
 import homeassistant.components.isy994 as isy
 from homeassistant.const import (
-    TEMP_CELSIUS, TEMP_FAHRENHEIT, STATE_OFF, STATE_ON)
+    TEMP_CELSIUS, TEMP_FAHRENHEIT, STATE_OFF, STATE_ON, UNIT_UV_INDEX)
 from homeassistant.helpers.typing import ConfigType
 
 _LOGGER = logging.getLogger(__name__)
@@ -77,7 +77,7 @@ UOM_FRIENDLY_NAME = {
     '64': 'shindo',
     '65': 'SML',
     '69': 'gal',
-    '71': 'UV index',
+    '71': UNIT_UV_INDEX,
     '72': 'V',
     '73': 'W',
     '74': 'W/m²',
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 2e3aeb4c334..349261242d5 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -279,6 +279,9 @@ MASS_KILOGRAMS = 'kg'  # type: str
 MASS_OUNCES = 'oz'  # type: str
 MASS_POUNDS = 'lb'  # type: str
 
+# UV Index units
+UNIT_UV_INDEX = 'UV index'  # type: str
+
 # Contains the information that is discovered
 ATTR_DISCOVERED = 'discovered'