Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 8:40 AM CDT on June 2, 2025, 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 Festus, MO with a reading of 0.7.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 7 in Cedar Hill between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 0.5
• Barnhart - 0.7
• Briarwood Estates - 0.7
• Byrnes Mill - 0.6
• Cedar Hill - 0.7
• Cedar Hill Lakes - 0.7
• Crystal City - 0.7
• De Soto - 0.7
• Festus - 0.7
• Herculaneum - 0.7
• High Ridge - 0.6
• Hillsboro - 0.7
• Horine - 0.7
• Imperial - 0.6
• Kimmswick - 0.6
• LaBarque Creek - 0.7
• Lake Tekakwitha - 0.7
• Murphy - 0.6
• Olympian Village - 0.7
• Parkdale - 0.6
• Peaceful Village - 0.6
• Pevely - 0.7
• Raintree Plantation - 0.7
• Scotsdale - 0.6
• Summer Set - 0.7