Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 8:16 AM CST on March 2, 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 Arnold, MO with a reading of 0.2.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 2.7 in LaBarque Creek between 12:00 PM - 1:00 PM CST today.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 0.2
• Barnhart - 0.1
• Briarwood Estates - 0.1
• Byrnes Mill - 0.2
• Cedar Hill - 0.1
• Cedar Hill Lakes - 0.1
• Crystal City - 0.1
• De Soto - 0.1
• Festus - 0.1
• Herculaneum - 0.1
• High Ridge - 0.2
• Hillsboro - 0.1
• Horine - 0.1
• Imperial - 0.1
• Kimmswick - 0.1
• LaBarque Creek - 0.2
• Lake Tekakwitha - 0.2
• Murphy - 0.2
• Olympian Village - 0.1
• Parkdale - 0.2
• Peaceful Village - 0.2
• Pevely - 0.1
• Raintree Plantation - 0.1
• Scotsdale - 0.2
• Summer Set - 0.1