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What Is the UV Index Scale? | The Old Farmer's Almanac

UV Index Scale: The Strength of the Sun- Say "No" to Sunburns!

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Sun Safety: How Long Does it Take to Burn?

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Are you playing it safe in the sun? The standardized UV index scale tells you how quickly your skin will burn without protection. Check out the UV Index and the latest UV forecast for your area!

What Is the UV Index?

The ultraviolet (UV) index is a scale representing the intensity of UV radiation the sun produces. The index was initially created by Canadian scientists in the early 1990s and has since been adapted worldwide. The UV Index also recommends “Actions to Take”—such as wearing sunscreen and a hat—to avoid getting burned.

UV Index Forecast

The U.S. National Weather Service (NWS) and the Environmental Protection Agency (EPA) measure ultraviolet levels daily and use these numbers to create daily exposure forecasts. See the UV Index forecast for your area by entering your zip code below (the information will open in a new tab) or visiting the EPA website.

 
UV Index Scale

Each UV Index Number is associated with “Exposure Level,” “Time to Burn,” and “Actions to Take.” People with lighter skin need to be more cautious. People with darker skin may be able to tolerate more exposure. Note that reflections off of snow, water, and white sand can nearly double UV strength.

UV Index Scale
UV Index NumberExposure LevelTime to BurnActions to Take
0Low60 minutesApply SPF 30+ sunscreen; wear sunglasses on bright days
1
2
3Moderate45 minutesApply SPF 30+ sunscreen every 2 hours; wear a hat and sunglasses; seek shade during midday hours (10 a.m. to 4 p.m.), when the sun’s rays are most intense
4
5
6High30 minutesApply SPF 30+ sunscreen every 2 hours; wear a wide-brimmed hat, sunglasses, and a long-sleeved shirt and pants if practical; seek shade during midday hours (10 a.m. to 4 p.m.), when the sun’s rays are most intense
7
8Very High15-25 minutesApply SPF 30+ sunscreen every 2 hours; wear a wide-brimmed hat, sunglasses, and a long-sleeved shirt and pants if practical; seek shade during midday hours (10 a.m. to 4 p.m.), when the sun’s rays are most intense; limit time outdoors
9
10
11 or higherExtreme10 minutesApply SPF 30+ sunscreen every 2 hours; wear a wide-brimmed hat, sunglasses, and a long-sleeved shirt and pants if practical; seek shade during midday hours (10 a.m. to 4 p.m.), when the sun’s rays are most intense; limit time outdoors

Source: EPA UV Index 

The Shadow Rule

Follow the EPA’s Shadow Rule to estimate how much UV radiation you are being exposed to:

  • If your shadow is longer than you are tall, UV exposure is lower.
  • If your shadow is shorter than you are tall, UV exposure is higher, and you should take necessary precautions.

Combating Sunburns

Sun safety is all about prevention. Wear broad-spectrum sunscreen whenever you are outside—no matter what the UV scale may say! If your fun in the Sun does result in sunburn, we hope that these 20 home remedies for sunburn will help provide relief.

Will it be sunny in your area this summer? Check out our Summer Weather Forecast to find out!

About The Author

Catherine Boeckmann

Catherine Boeckmann loves nature, stargazing, and gardening so it’s not surprise that she and The Old Farmer’s Almanac found each other. She leads digital content for the Almanac website, and is also a certified master gardener in the state of Indiana. Read More from Catherine Boeckmann