Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 4:58 PM CDT on September 16, 2025, all 25 cities in Jefferson County, MO in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Festus, MO with a reading of 3.1.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 6.9 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 - 3
• Barnhart - 3.1
• Briarwood Estates - 3.1
• Byrnes Mill - 3.1
• Cedar Hill - 3.1
• Cedar Hill Lakes - 3.1
• Crystal City - 3.1
• De Soto - 3.1
• Festus - 3.1
• Herculaneum - 3.1
• High Ridge - 3.1
• Hillsboro - 3.1
• Horine - 3.1
• Imperial - 3
• Kimmswick - 3
• LaBarque Creek - 3.1
• Lake Tekakwitha - 3.1
• Murphy - 3.1
• Olympian Village - 3.1
• Parkdale - 3.1
• Peaceful Village - 3.1
• Pevely - 3.1
• Raintree Plantation - 3.1
• Scotsdale - 3.1
• Summer Set - 3.1