Weather WorldFlat Lake, SD 7-Day Weather Forecast
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Flat Lake Weather Forecast
Flat Lake, SD Weather Forecast Date: 331 PM CDT Sun Aug 23 2026
Weather forecast for Flat Lake, SD
Tonight Lo: 61°F Lo: 16°C |
Tonight... Mostly cloudy. Lows in the lower 60s. Southeast winds 10 to 15 mph with gusts up to 25 mph. |
Mon Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Monday... Partly sunny. Humid with highs in the lower 80s. South winds 5 to 10 mph with gusts up to 20 mph. |
Tue Hi: 81°FHi: 27°C Lo: 60°F Lo: 16°C |
Tuesday... Mostly sunny. Highs in the lower 80s. West winds 15 to 20 mph. Gusts up to 35 mph in the afternoon. |
| Wed Hi: 80°FHi: 27°C Lo: 55°F Lo: 13°C |
Wednesday... Mostly clear. Highs around 80. Lows in the mid 50s. |
| Thu Hi: 80°FHi: 27°C Lo: 55°F Lo: 13°C |
Thursday... Mostly clear. Highs around 80. Lows in the mid 50s. |
| Thu Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Thursday... Mostly clear. Highs around 80. Lows in the mid 50s. |
Fri Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Friday... Partly sunny. A slight chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 20%. |
| Sat Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Saturday... Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs in the lower 80s. Chance of rain 20%. |
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