Butte County UV ForecastUnited StatesSDButte CountyVery high10.2Belle FourcheVery high UV, 10.2Very high9.8Castle RockVery high UV, 9.8ArpanBelle FourcheBelle Fourche Municipal AirportBelle Fourche National Wildlife RefugeBelle Fourche ReservoirCastle RockFruitdaleGuidinger ReservoirHerman ParkHighland ParkHooverNewellNewell LakeNislandRocky Point Recreation AreaVale