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The Ultraviolet (UV) Index provides a daily and hourly forecast of the UV radiation levels from the sun on a 1-11+ scale.

Download the free EPA SunWise UV Index app onto your smartphone. Your local Ultraviolet (UV) Index forecast is provided by the National Weather Service.

* To install the UV Index App on an Android device outside of Android's App Market, you will need to enable Unknown Sources. On your Android phone, go to Settings -> Application Settings and check the Unknown Sources checkbox. After the UV Index App is downloaded and installed, you may uncheck the Unknown Sources checkbox. 



UV Index Forecast by the
National Weather Service

Every day the National Weather Service calculates the predicted UV Index for the next day in each area of the U.S. This UV Index forecast is published in mid-afternoon (Eastern time zone) at the EPA website. The ozone layer shields the Earth from harmful ultraviolet (UV) radiation.

If the level of solar UV radiation is predicted to be unusually high, and consequently the risk of overexposure is greater than normal, the forecast includes UV Alerts.

Ozone depletion, as well as seasonal and weather variations, cause different amounts of UV radiation to reach the Earth at any given time. The UV Index, developed by the National Weather Service and EPA, indicates the strength of solar UV radiation on a scale from 1 (low) to 11+ (extremely high).

Check Your UV Index by Zip Code
Check Your UV Index by City and State


International UV Index

UVAwareness.com helps protect you from UV exposure by providing an hourly UV forecast for anywhere in the World.

Check your daily UV Index levels and use the Sun protection guide shown underneath each forecast to know how much protection you'll need for the hours you'll be in the Sun, and when it's best to stay in the shade altogether. Forecasts show hourly UV values from 6am to 6pm for the coming four days.


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