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Flat Lake, SD 7-Day Weather Forecast
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Flat Lake Weather Forecast
Flat Lake, SD Weather Forecast Date: 737 PM CDT Wed Aug 12 2026
Weather forecast for Flat Lake, SD
Tonight Lo: 61°F Lo: 16°C |
Tonight... Thunderstorms likely. Lows in the lower 60s. Northeast winds 5 to 10 mph. Chance of rain 70%. |
Thu Hi: 79°FHi: 26°C Lo: 60°F Lo: 16°C |
Thursday... Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Humid with highs in the upper 70s. East winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 20%. |
Fri Hi: 75°FHi: 24°C Lo: 61°F Lo: 16°C |
Friday... Partly sunny. Highs in the mid 70s. East winds 10 to 15 mph with gusts up to 30 mph. |
Sat Hi: 79°FHi: 26°C Lo: 59°F Lo: 15°C |
Saturday... Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 40%. |
| Sun Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Sunday... Partly sunny. Highs in the mid 70s. |
| Mon Hi: 79°FHi: 26°C Lo: 60°F Lo: 16°C |
Monday... Partly sunny. Highs in the upper 70s. |
| Tue Hi: 79°FHi: 26°C Lo: 59°F Lo: 15°C |
Tuesday... Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 20%. |
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