Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 8:55 AM CDT on August 16, 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 Murphy, 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 7.5 in LaBarque Creek between 2:00 PM - 3:00 PM CDT today.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 0.5
• Barnhart - 0.2
• Briarwood Estates - 0.2
• Byrnes Mill - 0.7
• Cedar Hill - 0.1
• Cedar Hill Lakes - 0.1
• Crystal City - 0.2
• De Soto - 0.2
• Festus - 0.2
• Herculaneum - 0.2
• High Ridge - 0.7
• Hillsboro - 0.2
• Horine - 0.2
• Imperial - 0.2
• Kimmswick - 0.2
• LaBarque Creek - 0.5
• Lake Tekakwitha - 0.5
• Murphy - 0.7
• Olympian Village - 0.2
• Parkdale - 0.7
• Peaceful Village - 0.7
• Pevely - 0.2
• Raintree Plantation - 0.2
• Scotsdale - 0.7
• Summer Set - 0.6