Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 2:53 PM CDT on June 10, 2026, all 25 cities in Jefferson County, MO in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Summer Set, MO with a reading of 9.8.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 10.6 in Festus between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 9.6
• Barnhart - 9.6
• Briarwood Estates - 9.6
• Byrnes Mill - 9.6
• Cedar Hill - 8.4
• Cedar Hill Lakes - 8.4
• Crystal City - 9.6
• De Soto - 9.6
• Festus - 9.6
• Herculaneum - 9.6
• High Ridge - 9.6
• Hillsboro - 9.6
• Horine - 9.6
• Imperial - 9.6
• Kimmswick - 9.6
• LaBarque Creek - 9
• Lake Tekakwitha - 9
• Murphy - 9.6
• Olympian Village - 9.6
• Parkdale - 9.6
• Peaceful Village - 9.6
• Pevely - 9.6
• Raintree Plantation - 9.6
• Scotsdale - 9.6
• Summer Set - 9.8