Expires:202605152000;;599501 FPUS53 KFSD 151250 ZFPFSD Zone Forecasts for SE South Dakota/NW Iowa/SW Minnesota National Weather Service Sioux Falls SD 749 AM CDT Fri May 15 2026 IAZ001-152000- Lyon- Including the cities of Rock Rapids, George, Inwood, and Larchwood 749 AM CDT Fri May 15 2026 .TODAY...Sunny. Highs in the upper 80s. South winds around 5 mph, becoming west this afternoon. .TONIGHT...Partly cloudy. Lows in the lower 50s. Northwest winds 5 to 10 mph, becoming northeast after midnight. .SATURDAY...Mostly sunny in the morning, then becoming mostly cloudy. Highs in the mid 80s. Northeast winds 5 to 10 mph, becoming east 10 to 15 mph in the afternoon. .SATURDAY NIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows in the mid 50s. East winds 15 to 20 mph. Chance of rain 80 percent. .SUNDAY...Showers with a chance of thunderstorms. Breezy and more humid with highs in the mid 80s. Southeast winds 20 to 25 mph with gusts up to 35 mph. Chance of rain 80 percent. .SUNDAY NIGHT...A chance of thunderstorms. Showers. Lows in the lower 50s. Chance of rain 80 percent. .MONDAY...Mostly cloudy with a chance of showers in the morning, then showers with a chance of thunderstorms in the afternoon. Not as warm with highs in the mid 70s. Chance of rain 80 percent. .MONDAY NIGHT...Showers with a chance of thunderstorms in the evening, then a chance of showers after midnight. Breezy with lows in the mid 40s. Chance of rain 80 percent. .TUESDAY...Cloudy in the morning, then becoming partly sunny. Breezy, cooler with highs around 60. .TUESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 30s. .WEDNESDAY...Mostly sunny. Highs in the mid 60s. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 40s. .THURSDAY...Mostly sunny. Highs in the lower 70s. $$