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Round Lake, SD Weather Forecast
Round Lake, SD Weather Forecast Date: 1121 AM CDT Sun Sep 13 2026
The area/counties/county of: Roberts, including the city of Sisseton.or toggle through each period.
Rest of Today... Mostly sunny. Highs in the upper 60s. North winds around 5 mph.
Tonight... Mostly clear in the evening, then becoming partly cloudy. Lows around 50. Southeast winds 10 to 15 mph.
Monday... A slight chance of thunderstorms. Showers, windy with highs in the mid 60s. Southeast winds 20 to 30 mph with gusts up to 40 mph. Chance of rain near 100%.
Monday Night... Mostly clear and breezy. Lows in the lower 50s. Southwest winds 10 to 15 mph with gusts up to 30 mph, increasing to west 20 to 25 mph with gusts up to 40 mph after midnight.
Tuesday... Mostly sunny. Highs in the upper 60s. Northwest winds 15 to 20 mph. Gusts up to 35 mph in the morning.
Tuesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 40s.
Wednesday... Partly sunny with a 40% chance of showers. Highs in the mid 60s.
Wednesday Night... Mostly cloudy. Lows around 50.
Thursday... Partly sunny. Highs in the lower 70s.
Thursday Night... Partly cloudy with a slight chance of showers in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the lower 50s. Chance of rain 40%.
Friday... Mostly cloudy with a 50% chance of showers. Highs in the lower 70s.
Friday Night... Mostly cloudy with a 40% chance of showers. Lows in the lower 50s.
POP = Probability of Precipitation
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