diff --git a/homeassistant/components/metoffice/sensor.py b/homeassistant/components/metoffice/sensor.py
index 0682c458792f..678d02d9d836 100644
--- a/homeassistant/components/metoffice/sensor.py
+++ b/homeassistant/components/metoffice/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     SPEED_MILES_PER_HOUR,
     TEMP_CELSIUS,
     UNIT_PERCENTAGE,
+    UNIT_UV_INDEX,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -72,7 +73,7 @@ SENSOR_TYPES = {
     "wind_gust": ["Wind Gust", SPEED_MILES_PER_HOUR],
     "visibility": ["Visibility", None],
     "visibility_distance": ["Visibility Distance", LENGTH_KILOMETERS],
-    "uv": ["UV", None],
+    "uv": ["UV", UNIT_UV_INDEX],
     "precipitation": ["Probability of Precipitation", UNIT_PERCENTAGE],
     "humidity": ["Humidity", UNIT_PERCENTAGE],
 }
diff --git a/homeassistant/components/openuv/sensor.py b/homeassistant/components/openuv/sensor.py
index 0d4a8b73a087..162fac50c6c4 100644
--- a/homeassistant/components/openuv/sensor.py
+++ b/homeassistant/components/openuv/sensor.py
@@ -1,7 +1,7 @@
 """Support for OpenUV sensors."""
 import logging
 
-from homeassistant.const import TIME_MINUTES
+from homeassistant.const import TIME_MINUTES, UNIT_UV_INDEX
 from homeassistant.core import callback
 from homeassistant.util.dt import as_local, parse_datetime
 
@@ -43,9 +43,9 @@ UV_LEVEL_LOW = "Low"
 
 SENSORS = {
     TYPE_CURRENT_OZONE_LEVEL: ("Current Ozone Level", "mdi:vector-triangle", "du"),
-    TYPE_CURRENT_UV_INDEX: ("Current UV Index", "mdi:weather-sunny", "index"),
+    TYPE_CURRENT_UV_INDEX: ("Current UV Index", "mdi:weather-sunny", UNIT_UV_INDEX),
     TYPE_CURRENT_UV_LEVEL: ("Current UV Level", "mdi:weather-sunny", None),
-    TYPE_MAX_UV_INDEX: ("Max UV Index", "mdi:weather-sunny", "index"),
+    TYPE_MAX_UV_INDEX: ("Max UV Index", "mdi:weather-sunny", UNIT_UV_INDEX),
     TYPE_SAFE_EXPOSURE_TIME_1: (
         "Skin Type 1 Safe Exposure Time",
         "mdi:timer",
diff --git a/homeassistant/components/rfxtrx/__init__.py b/homeassistant/components/rfxtrx/__init__.py
index 39cbde08c013..b37ad8c15a83 100644
--- a/homeassistant/components/rfxtrx/__init__.py
+++ b/homeassistant/components/rfxtrx/__init__.py
@@ -19,6 +19,7 @@ from homeassistant.const import (
     POWER_WATT,
     TEMP_CELSIUS,
     UNIT_PERCENTAGE,
+    UNIT_UV_INDEX,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
@@ -57,7 +58,7 @@ DATA_TYPES = OrderedDict(
         ("Sound", ""),
         ("Sensor Status", ""),
         ("Counter value", ""),
-        ("UV", "uv"),
+        ("UV", UNIT_UV_INDEX),
         ("Humidity status", ""),
         ("Forecast", ""),
         ("Forecast numeric", ""),
diff --git a/homeassistant/components/tellduslive/sensor.py b/homeassistant/components/tellduslive/sensor.py
index 472c430da163..693616ab78ce 100644
--- a/homeassistant/components/tellduslive/sensor.py
+++ b/homeassistant/components/tellduslive/sensor.py
@@ -11,6 +11,7 @@ from homeassistant.const import (
     TEMP_CELSIUS,
     TIME_HOURS,
     UNIT_PERCENTAGE,
+    UNIT_UV_INDEX,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
@@ -44,7 +45,7 @@ SENSOR_TYPES = {
     SENSOR_TYPE_WINDDIRECTION: ["Wind direction", "", "", None],
     SENSOR_TYPE_WINDAVERAGE: ["Wind average", SPEED_METERS_PER_SECOND, "", None],
     SENSOR_TYPE_WINDGUST: ["Wind gust", SPEED_METERS_PER_SECOND, "", None],
-    SENSOR_TYPE_UV: ["UV", "UV", "", None],
+    SENSOR_TYPE_UV: ["UV", UNIT_UV_INDEX, "", None],
     SENSOR_TYPE_WATT: ["Power", POWER_WATT, "", None],
     SENSOR_TYPE_LUMINANCE: ["Luminance", "lx", None, DEVICE_CLASS_ILLUMINANCE],
     SENSOR_TYPE_DEW_POINT: ["Dew Point", TEMP_CELSIUS, None, DEVICE_CLASS_TEMPERATURE],