UV Index Today in South Dakota (SD) Friday, May 22, 2026 -1:39 PMCDT (GMT-5) The average maximum UV Index today across 189 locations in South Dakota (SD) , is 4.8. The highest projected maximum is 7.6 in Hot Springs at 2:00 PM CDT, while the lowest projected maximum is 0.5 in Mobridge at 11:00 AM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 7.3. The highest projected maximum is 8 in Custer at 2:00 PM CDT, and the lowest projected maximum is 6.1 in Piedmont at 1:00 PM CDT.
66 Counties in South Dakota (SD) Average Maximum UV Index Today
Aurora County - 6.9
Beadle County - 6.7
Bennett County - 7.5
Bon Homme County - 7.2
Brookings County - 2.4
Brown County - 3.5
Brule County - 6.2
Buffalo County - 4.5
Butte County - 7.1
Campbell County - 0.5
Charles Mix County - 6.4
Clark County - 3.8
Clay County - 5.6
Codington County - 1.5
Corson County - 0.5
Custer County - 7.6
Davison County - 6.5
Day County - 0.8
Deuel County - 2.3
Dewey County - 0.9
Douglas County - 6.5
Edmunds County - 3.9
Fall River County - 7.5
Faulk County - 5.6
Grant County - 1.3
Gregory County - 6.7
Haakon County - 7
Hamlin County - 2.4
Hand County - 6.9
Hanson County - 7.1
Harding County - 5.6
Hughes County - 2.6
Hutchinson County - 7.1
Hyde County - 2.8
Jackson County - 7
Jerauld County - 6.1
Jones County - 5.1
Kingsbury County - 3
Lake County - 3.6
Lawrence County - 7.3
Lincoln County - 5.5
Lyman County - 5.3
McCook County - 5.9
McPherson County - 1.1
Marshall County - 1.1
Meade County - 7.3
Mellette County - 6.6
Miner County - 4.7
Minnehaha County - 4.8
Moody County - 3
Oglala Lakota County - 7.5
Pennington County - 7.2
Perkins County - 0.6
Potter County - 3.1
Roberts County - 0.7
Sanborn County - 5.2
Spink County - 4.3
Stanley County - 2.6
Sully County - 3.4
Todd County - 5.7
Tripp County - 5.3
Turner County - 6
Union County - 2.9
Walworth County - 0.8
Yankton County - 6.8
Ziebach County - 1151 Places in South Dakota (SD) Maximum UV Index Today
Aberdeen - 4.1
Agency Village - 0.7
Alcester - 6
Alexandria - 7
Allen - 7.5
Antelope - 5.3
Arlington - 2.6
Armour - 7.1
Ashland Heights - 7.2
Aurora - 2.3
Avon - 7.2
Baltic - 3.4
Belle Fourche - 7.1
Beresford - 6
Big Stone City - 1.5
Blackhawk - 7.2
Blucksberg Mountain - 7.4
Boulder Canyon - 7.2
Box Elder - 7.2
Brandon - 4.7
Britton - 1.1
Brookings - 2.3
Bryant - 1.6
Burke - 6.4
Canistota - 5.7
Canton - 4.1
Castlewood - 1.4
Centerville - 6.3
Chamberlain - 6.2
Clark - 3.8
Clear Lake - 2.3
Colman - 2.7
Colonial Pine Hills - 7.3
Colton - 6.2
Corsica - 5.9
Crooks - 3.4
Custer - 7.6
Dakota Dunes - 1.5
Deadwood - 7.2
Dell Rapids - 3.4
De Smet - 1.6
Dupree - 0.9
Eagle Butte - 1.1
Edgemont - 7.5
Elk Point - 4.9
Elkton - 1.7
Emery - 7.2
Estelline - 3.1
Eureka - 1.1
Faulkton - 5.6
Flandreau - 3.3
Fort Pierre - 2.6
Fort Thompson - 4.5
Freeman - 7.2
Garretson - 4.7
Gayville - 5.9
Gettysburg - 3.1
Green Valley - 7.2
Gregory - 7
Groton - 1.5
Harrisburg - 5.8
Hartford - 6.2
Herreid - 0.5
Highmore - 2.8
Hill City - 7.5
Hot Springs - 7.6
Howard - 4.7
Humboldt - 6.2
Huron - 6.8
Ipswich - 3.2
Jefferson - 1.5
Johnson Siding - 7.5
Kyle - 7.3
Lake Andes - 6.2
Lake Madison - 3.1
Lake Norden - 3.5
Lake Preston - 4.7
Lead - 7.6
Lemmon - 0.6
Lennox - 6.3
Lower Brule - 4.5
McLaughlin - 0.5
Madison - 3.1
Manderson-White Horse Creek - 7.5
Marion - 5.7
Martin - 7.5
Meadow View Addition - 5.8
Menno - 7.2
Milbank - 0.7
Miller - 6.9
Mina - 4.3
Mission - 5.3
Mitchell - 6.5
Mobridge - 0.5
Murdo - 5.1
New Underwood - 7.2
North Eagle Butte - 1.1
North Sioux City - 1.5
North Spearfish - 7.2
Oacoma - 6.2
Oglala - 7.4
Onida - 3.4
Parker - 5.7
Parkston - 6.9
Parmelee - 6.2
Philip - 7
Piedmont - 7.4
Pierre - 2.6
Pine Ridge - 7.6
Plankinton - 6.9
Platte - 5.6
Ramona - 4.7
Rapid City - 7.3
Rapid Valley - 7.2
Redfield - 4.3
Rosebud - 5.3
St. Francis - 6.2
Salem - 4.9
Scotland - 7
Selby - 1
Shindler - 5.8
Sioux Falls - 5.8
Sisseton - 0.7
Spearfish - 7.2
Springfield - 7.4
Sturgis - 7.2
Summerset - 7.2
Tea - 5.8
Timber Lake - 0.6
Tripp - 6.9
Tyndall - 7
Valley Springs - 4.7
Vermillion - 6.3
Viborg - 6.3
Volga - 3.6
Wagner - 7
Wall - 6.5
Wanblee - 7
Warner - 3.1
Watertown - 1.2
Webster - 1.2
Wessington Springs - 6.1
White River - 6.6
Whitewood - 7.2
Winner - 5.3
Wolsey - 6.6
Wonderland Homes - 7.2
Woonsocket - 5.2
Worthing - 5.9
Wounded Knee - 7.5
Yankton - 7.2