Jefferson County, MO: Current UV Index and Hourly Forecast

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As of 4:43 PM CDT on May 17, 2026, 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 Cedar Hill, MO with a reading of 4.8.

Over the next 24 hours, the highest UV Index reading in Jefferson County, MO is expected to be 9.4 in Cedar Hill between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in Jefferson County, MO

• Arnold - 4.6
• Barnhart - 4.7
• Briarwood Estates - 4.7
• Byrnes Mill - 4.7
• Cedar Hill - 4.8
• Cedar Hill Lakes - 4.8
• Crystal City - 4.7
• De Soto - 4.7
• Festus - 4.7
• Herculaneum - 4.7
• High Ridge - 4.7
• Hillsboro - 4.7
• Horine - 4.7
• Imperial - 4.7
• Kimmswick - 4.7
• LaBarque Creek - 4.7
• Lake Tekakwitha - 4.7
• Murphy - 4.7
• Olympian Village - 4.7
• Parkdale - 4.7
• Peaceful Village - 4.7
• Pevely - 4.7
• Raintree Plantation - 4.7
• Scotsdale - 4.7
• Summer Set - 4.8