Ultraviolet Index

Click for UV index values for the following cities:

Bloomington

Champaign

Danville

Decatur

Effingham

Galesburg

Jacksonville

Lawrenceville

Mattoon

Peoria

Rushville

Springfield

About the UV Index:

The National Weather Service works with the Environmental Protection Agency, to forecast the Ultraviolet (UV) Index for the U.S.

The UV index is a measure to help you determine the effects of the sun on outdoor activities.  It is computed using forecast ozone levels, cloudiness, and elevation.  Values are effective at solar noon, which is when the sun is at its highest point of the day.  (Solar noon generally does not correspond to the clock time of 12:00 noon.)  Overexposure during days with high UV values can be harmful, both in the short term and over the long term.  Exposure to surface objects that reflect light (such as sand and water) can make the UV index even higher in such locations.

The UV Index runs on a scale of 1 to 11+:

UV Value and Category

Effects

1-2 
("Low")

A UV Index reading of 2 or less means low danger from the sun's UV rays for the average person:

  • Wear sunglasses on bright days. In winter, reflection off snow can nearly double UV strength.
  • If you burn easily, cover up and use sunscreen of at least SPF-15.

3-5
("Moderate")

A UV Index reading of 3 to 5 means moderate risk of harm from unprotected sun exposure.

  • Take precautions, such as covering up, if you will be outside.
  • Stay in shade near midday when the sun is strongest.

6-7
("High")

A UV Index reading of 6 to 7 means high risk of harm from unprotected sun exposure. Apply a sunscreen with a SPF of at least 15. Wear a wide-brim hat and sunglasses to protect your eyes.

  • Protection against sunburn is needed.
  • Reduce time in the sun between 10 a.m. and 4 p.m.
  • Cover up, wear a hat and sunglasses, and use sunscreen.

8-10
("Very High")

A UV Index reading of 8 to 10 means very high risk of harm from unprotected sun exposure. Minimize sun exposure during midday hours, from 10 a.m. to 4 p.m. Protect yourself by liberally applying a sunscreen with an SPF of at least 15. Wear protective clothing and sunglasses to protect the eyes.

  • Take extra precautions. Unprotected skin will be damaged and can burn quickly.
  • Minimize sun exposure between 10 a.m. and 4 p.m. Otherwise, seek shade, cover up, wear a hat and sunglasses, and use sunscreen.

11+
("Extreme")

A UV Index reading of 11 or higher means extreme risk of harm from unprotected sun exposure. Try to avoid sun exposure during midday hours, from 10 a.m. to 4 p.m. Apply sunscreen with an SPF of at least 15 liberally every 2 hours.

  • Take all precautions. Unprotected skin can burn in minutes. Beachgoers should know that white sand and other bright surfaces reflect UV and will increase UV exposure.
  • Try to avoid sun exposure between 10 a.m. and 4 p.m.
  • Seek shade, cover up, wear a hat and sunglasses, and use sunscreen.

Remember that the UV values over reflective surfaces (such as white sand, snow cover, and water) can increase these values.

By visiting the EPA's Sunwise page at: http://www.epa.gov/sunwise/uvindex.html, you can get UV index values for other locations by entering specific cities or ZIP codes.  You can also access nationwide maps of UV index values for the next 4 days.



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