Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 5:50 PM CDT on August 9, 2026, all 25 cities in Jefferson County, MO in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Cedar Hill, MO with a reading of 2.3.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 8.2 in Summer Set between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 2.2
• Barnhart - 2.2
• Briarwood Estates - 2.2
• Byrnes Mill - 2.2
• Cedar Hill - 2.3
• Cedar Hill Lakes - 2.3
• Crystal City - 2.2
• De Soto - 2.2
• Festus - 2.2
• Herculaneum - 2.2
• High Ridge - 2.2
• Hillsboro - 2.2
• Horine - 2.2
• Imperial - 2.2
• Kimmswick - 2.2
• LaBarque Creek - 2.3
• Lake Tekakwitha - 2.3
• Murphy - 2.2
• Olympian Village - 2.2
• Parkdale - 2.2
• Peaceful Village - 2.2
• Pevely - 2.2
• Raintree Plantation - 2.2
• Scotsdale - 2.2
• Summer Set - 2.2