St. Louis County, MO: Current UV Index and Hourly Forecast

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As of 8:09 AM CDT on September 21, 2026, all 98 cities in St. Louis County, MO in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Ballwin, MO with a reading of 0.3.

Over the next 24 hours, the highest UV Index reading in St. Louis County, MO is expected to be 3.8 in Ballwin between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in St. Louis County, MO

• Affton - 0.2
• Ballwin - 0.3
• Bel-Nor - 0.2
• Bel-Ridge - 0.2
• Bella Villa - 0.2
• Bellefontaine Neighbors - 0.2
• Bellerive Acres - 0.2
• Berkeley - 0.2
• Beverly Hills - 0.2
• Black Jack - 0.2
• Breckenridge Hills - 0.2
• Brentwood - 0.2
• Bridgeton - 0.2
• Calverton Park - 0.2
• Castle Point - 0.2
• Champ - 0.2
• Charlack - 0.2
• Chesterfield - 0.2
• Clarkson Valley - 0.2
• Clayton - 0.2
• Concord - 0.2
• Cool Valley - 0.2
• Country Club Hills - 0.2
• Country Life Acres - 0.3
• Crestwood - 0.3
• Creve Coeur - 0.2
• Crystal Lake Park - 0.3
• Dellwood - 0.2
• Des Peres - 0.3
• Edmundson - 0.2
• Ellisville - 0.3
• Eureka - 0.2
• Fenton - 0.3
• Ferguson - 0.2
• Flordell Hills - 0.2
• Florissant - 0.2
• Frontenac - 0.2
• Glasgow Village - 0.2
• Glen Echo Park - 0.2
• Glendale - 0.3
• Grantwood Village - 0.2
• Green Park - 0.2
• Greendale - 0.2
• Hanley Hills - 0.2
• Hazelwood - 0.2
• Hillsdale - 0.2
• Huntleigh - 0.3
• Jennings - 0.2
• Kinloch - 0.2
• Kirkwood - 0.3
• Ladue - 0.2
• Lakeshire - 0.2
• Lemay - 0.2
• Manchester - 0.3
• Maplewood - 0.2
• Marlborough - 0.2
• Maryland Heights - 0.2
• Mehlville - 0.2
• Moline Acres - 0.2
• Normandy - 0.2
• Northwoods - 0.2
• Norwood Court - 0.2
• Oakland - 0.3
• Oakville - 0.2
• Old Jamestown - 0.2
• Olivette - 0.2
• Overland - 0.2
• Pagedale - 0.2
• Pasadena Hills - 0.2
• Pasadena Park - 0.2
• Pine Lawn - 0.2
• Richmond Heights - 0.2
• Riverview - 0.2
• Rock Hill - 0.2
• Sappington - 0.2
• Shrewsbury - 0.2
• Spanish Lake - 0.2
• St. Ann - 0.2
• St. George - 0.2
• St. John - 0.2
• Sunset Hills - 0.3
• Sycamore Hills - 0.2
• Town and Country - 0.2
• Twin Oaks - 0.3
• University City - 0.2
• Uplands Park - 0.2
• Valley Park - 0.3
• Velda City - 0.2
• Velda Village Hills - 0.2
• Vinita Park - 0.2
• Warson Woods - 0.3
• Webster Groves - 0.2
• Wellston - 0.2
• Westwood - 0.2
• Wilbur Park - 0.2
• Wildwood - 0.2
• Winchester - 0.3
• Woodson Terrace - 0.2