Weather WorldFlat Lake, SD 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Flat Lake, SD Weather Forecast
Flat Lake, SD Weather Forecast Date: 333 PM CDT Sun Aug 16 2026
The area/counties/county of: Marshall, including the city of Britton.or toggle through each period.
Tonight... Mostly clear this evening, then becoming partly cloudy. Lows in the upper 50s. Northwest winds 5 to 10 mph, becoming south after midnight.
Monday... Partly sunny. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50%.
Monday Night... Partly cloudy with a chance of thunderstorms in the evening, then mostly cloudy after midnight. Patchy fog after midnight. Lows in the upper 50s. West winds 5 to 10 mph with gusts up to 20 mph, becoming northwest after midnight. Chance of rain 40%.
Tuesday... Partly sunny with a 20% chance of showers. Highs in the mid 70s. North winds around 5 mph.
Tuesday Night... Partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph, becoming southeast after midnight.
Wednesday... Partly sunny. Highs in the upper 70s.
Wednesday Night... Partly cloudy. A slight chance of thunderstorms in the evening. Lows in the upper 50s. Chance of rain 20%.
Thursday... Partly sunny. Highs around 80.
Thursday Night... Mostly clear in the evening, then becoming partly cloudy. A 20% chance of thunderstorms. Lows around 60.
Friday... Partly sunny. A slight chance of showers in the morning, then a slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20%.
Friday Night... Mostly clear. Lows in the upper 50s.
Saturday... Partly cloudy. Highs in the upper 70s. Lows in the lower 60s.
Saturday Night... Partly cloudy. Highs in the upper 70s. Lows in the lower 60s.
POP = Probability of Precipitation
Flat Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...