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A UV Index reading of 3 to 5 means moderate risk of harm from unprotected sun exposure. Stay in shade near midday when the sun is strongest. If outdoors, wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses.
The UV Index scale used in the United States conforms with international guidelines for UVI reporting established by the World Health Organization. Learn how to read the UV index Scale to help you avoid harmful exposure to UV radiation.
UV Index Today provides national and local UV index forecasts for 40,000+ cities in the United States. Our forecasts include the real-time UV index, the hourly UV index, and the UV Index forecast for the next five days. Our forecasts are built using data provided by NOAA.
The Ultraviolet (UV) Index predicts the ultraviolet radiation levels on a 1-11+ scale. The UV Index provides a daily forecast of the expected intensity of UV radiation from the sun. Please enter a ZIP Code or a City and State, to calculate the UV Index for that location.
The Ultraviolet (UV) Index predicts the UV radiation levels on a 1 – 11+ scale. The UV Index provides a daily forecast of the expected intensity of UV radiation from the sun. Learn more about how the UV Index can be calculated and analyzed and sign up for UV index email alerts.
The UV Index scale used in the United States conforms with international guidelines for UVI reporting established by the World Health Organization ExitLearn how to read the UV index Scale to help you avoid harmful exposure to UV radiation.
The UV Index provides a forecast of the expected risk of overexposure to UV radiation from the sun. The National Weather Service calculates the UV Index forecast for most ZIP codes across the U.S., and EPA publishes this information.