037 FPUS63 KFSD 270851 SFPSD SDZ001>074-272300- STATE FORECAST FOR SOUTH DAKOTA NATIONAL WEATHER SERVICE SIOUX FALLS SD 350 AM CDT Mon Aug 27 2018 .TODAY...Mostly cloudy. Chance of thunderstorms north and east. Highs from the mid 60s far northwest to upper 80s south. .TONIGHT...Mostly cloudy. Chance of showers and thunderstorms north and east. Lows from the upper 40s far west, to mid 60s far southeast. .TUESDAY...Decreasing clouds. Slight chance of daytime showers and thunderstorms far west and southeast. Highs 65 to 75. .WEDNESDAY...Mostly clear. Lows from the mid 40s to lower 50s. Highs in the mid 70s to mid 80s. .THURSDAY...Increasing clouds. Chance of thunderstorms east, mainly at night. Lows mid 50s to lower 60s. Highs from the upper 70s east to lower 90s central. .FRIDAY...Partly cloudy. Chance of thunderstorms east. Lows mid 50s to mid 60s. Highs 80 to 90. $$