Expires:202605181200;;747060 FPUS53 KFSD 180445 ZFPFSD Zone Forecasts for SE South Dakota/NW Iowa/SW Minnesota National Weather Service Sioux Falls SD 1144 PM CDT Sun May 17 2026 IAZ022-181200- Buena Vista- Including the city of Storm Lake 1144 PM CDT Sun May 17 2026 .OVERNIGHT...Cloudy with a chance of showers and thunderstorms. Some thunderstorms may be severe late this evening. Lows in the mid 50s. Southeast winds 15 to 20 mph, becoming west around 10 mph. Chance of rain 50 percent. .MONDAY...Mostly cloudy with a chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. Not as warm with highs in the upper 60s. Northwest winds 5 to 10 mph, becoming northeast in the afternoon. Chance of rain 70 percent. .MONDAY NIGHT...Showers with a chance of thunderstorms in the evening, then a chance of showers after midnight. Locally heavy rainfall possible in the evening. Lows in the mid 40s. Northeast winds 10 to 15 mph, becoming northwest 15 to 20 mph with gusts up to 30 mph after midnight. Chance of rain 90 percent. .TUESDAY...Cloudy in the morning, then becoming partly sunny. Cooler with highs in the upper 50s. Northwest winds 15 to 20 mph with gusts up to 30 mph. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 30s. Northwest winds 10 to 15 mph with gusts up to 25 mph, becoming north around 5 mph after midnight. .WEDNESDAY...Mostly sunny. Highs in the lower 60s. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 40s. .THURSDAY...Partly sunny. Highs in the mid 60s. .THURSDAY NIGHT...Mostly cloudy. Lows in the mid 40s. .FRIDAY...Partly sunny. Highs in the lower 70s. .FRIDAY NIGHT...Mostly cloudy with a chance of showers. Lows in the upper 40s. Chance of rain 30 percent. .SATURDAY...Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 30 percent. .SATURDAY NIGHT...Partly cloudy. Lows in the mid 50s. .SUNDAY...Mostly sunny. Highs in the mid 80s. $$