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Flat Lake, SD Weather Forecast
Flat Lake, SD Weather Forecast Date: 921 PM CDT Wed Oct 28 2026
The area/counties/county of: Marshall, including the city of Britton.or toggle through each period.
Tonight... Mostly clear. Lows in the lower 30s. West winds 5 to 10 mph.
Thursday... Partly sunny. Highs in the lower 50s. Southwest winds around 5 mph, becoming east around 5 mph in the afternoon.
Thursday Night... Partly cloudy. Lows in the mid 30s. Southeast winds 5 to 10 mph.
Friday... Partly sunny. Highs in the lower 50s. East winds 5 to 10 mph with gusts up to 20 mph.
Friday Night... Mostly cloudy. A slight chance of rain after midnight. Lows around 40. East winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20%.
Saturday... Cloudy. A slight chance of rain in the morning. Highs in the mid 50s. Chance of rain 20%.
Saturday Night... Mostly cloudy. Lows in the upper 40s. Highs in the lower 60s.
Sunday... Mostly cloudy. Lows in the upper 40s. Highs in the lower 60s.
Sunday Night... Mostly cloudy with a 20% chance of rain. Lows in the lower 50s.
Monday... Rain likely. Highs in the mid 50s. Lows in the mid 40s. Chance of rain 70%.
Monday Night... Rain likely. Highs in the mid 50s. Lows in the mid 40s. Chance of rain 70%.
Tuesday... Mostly cloudy with a 50% chance of rain. Highs in the lower 50s.
Tuesday Night... Mostly cloudy with a 40% chance of rain. Lows around 40. Highs in the upper 40s.
POP = Probability of Precipitation
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