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Getting Started with UV Index Forecasts

June 18, 2026 · The Clime Team
Getting Started with UV Index Forecasts

Understanding the Ultraviolet (UV) Index is essential for safeguarding your skin and eyes from harmful UV radiation. The UV Index provides a daily forecast of the expected intensity of UV radiation from the sun, helping you plan outdoor activities safely.

What Is the UV Index?

The UV Index is a scale ranging from 0 to 11+, indicating the potential for harm from unprotected sun exposure. A higher number signifies a greater risk of harm. For example, a UV Index of 3 to 5 suggests a moderate risk, while a reading of 8 to 10 indicates a very high risk. An index of 11 or higher is considered extreme, requiring maximum protection. (epa.gov)

How Is the UV Index Forecasted?

The Environmental Protection Agency (EPA) calculates the UV Index based on factors such as time of day, geographic location, altitude, and atmospheric conditions. This forecast is updated daily and is available for numerous locations across the United States. (epa.gov)

Where Can I Find UV Index Forecasts?

You can access UV Index forecasts through several platforms:

  • EPA's Envirofacts Website: Enter your ZIP code or city and state to view the UV Index for your area. (enviro.epa.gov)

  • Mobile Applications: The EPA offers a mobile app for iPhone users, providing UV Index information on the go. (espanol.epa.gov)

  • National Weather Service: Provides UV Index forecasts for various U.S. cities. (weather.gov)

How Should I Protect Myself Based on the UV Index?

Protection measures vary depending on the UV Index level:

  • Low (0-2): Minimal risk; wear sunglasses on bright days.

  • Moderate (3-5): Take precautions if outdoors; wear a hat and sunglasses, and use sunscreen with SPF 30+.

  • High (6-7): Protection against sun damage is needed; wear a wide-brimmed hat, sunglasses, and use sunscreen with SPF 30+.

  • Very High (8-10): Protection against sun damage is needed; minimize sun exposure between 10 a.m. and 4 p.m., seek shade, and use sunscreen with SPF 30+.

  • Extreme (11+): Protection against sun damage is needed; avoid sun exposure between 10 a.m. and 4 p.m., seek shade, and use sunscreen with SPF 30+. (enviro.epa.gov)

How Can I Stay Informed About UV Index Levels?

Regularly checking the UV Index helps you plan outdoor activities safely. The EPA's EnviroFlash service allows you to sign up for email alerts about UV Index levels and UV Alerts in your area. (epa.gov)

By staying informed and taking appropriate precautions, you can enjoy outdoor activities while minimizing the risks associated with UV radiation.

Highlights:

  • UV Index Overview | US EPA, Published on Monday, March 23
  • UV Index Applications | US EPA, Published on Monday, January 26
  • UV Alert | US EPA, Published on Wednesday, January 28

Frequently Asked Questions