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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.
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 index, or UV index, is an international standard measurement of the strength of the sunburn-producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.
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.
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.
UV index is a color-coded scale that gives you an idea of your UV ray exposure. It works like this: Low exposure (green): 1-2. Moderate exposure (yellow): 3-5. High exposure (orange): 6-7. Very...
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.
What is the UV index? The UVI is a measure of the level of UV radiation. The values of the index range from zero upward - the higher the UVI, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur.
The UV Index predicts the ultraviolet radiation levels on a 1-11+ scale, helping people determine appropriate sun-protective behaviors. Several fact sheets explain the UV Index and steps you can take to minimize the risks from overexposure to the sun's rays.
The UV index measures the intensity of ultraviolet (UV) radiation from the sun at a location. It’s calculated using the latitude and altitude of that place, time of day, time of year, ground conditions, cloud cover and state of the ozone layer in the atmosphere.