Clime
← Back to Blog
Tips

Understanding and Accessing UV Index Forecasts in the United States

June 18, 2026 · The Clime Team
Understanding and Accessing UV Index Forecasts in the United States

The Ultraviolet (UV) Index is a daily measure of the strength of ultraviolet radiation from the sun, ranging from 1 (low) to 11+ (extreme). This index helps individuals assess the risk of overexposure to UV radiation and take appropriate protective measures. (epa.gov)

How to Access UV Index Forecasts Easily

Accessing UV Index forecasts is straightforward through several official resources:

  • EPA's Envirofacts: Enter your ZIP code or city and state to receive localized UV Index forecasts. (epa.gov)

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

  • EPA's UV Index App: Available for iPhone users, this app offers daily UV Index forecasts and sun safety tips. (epa.gov)

Understanding the UV Index Scale

The UV Index is categorized as follows:

  • 1-2 (Low): Minimal risk; no protection needed.

  • 3-5 (Moderate): Moderate risk; protection needed.

  • 6-7 (High): High risk; protection needed.

  • 8-10 (Very High): Very high risk; extra protection needed.

  • 11+ (Extreme): Extreme risk; take all precautions.

These categories help individuals determine the necessary precautions to take based on the day's UV radiation levels. (epa.gov)

Sun Safety Tips

Regardless of the UV Index level, it's essential to practice sun safety:

  • Limit Sun Exposure: Especially between 10 a.m. and 4 p.m., when UV radiation is strongest.

  • Seek Shade: Whenever possible, especially during peak sun hours.

  • Use Sunscreen: Apply a broad-spectrum sunscreen with an SPF of at least 30.

  • Wear Protective Clothing: Opt for wide-brimmed hats, sunglasses, and tightly woven clothing.

  • Avoid Tanning Beds: They can increase the risk of skin damage and cancer.

By staying informed about the UV Index and adhering to these safety measures, you can enjoy outdoor activities while minimizing the risks associated with sun exposure. (cdc.gov)

Highlights:

  • UV Alert | US EPA, Published on Wednesday, January 28
  • Web Services | US EPA, Published on Wednesday, February 04

Frequently Asked Questions