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Heap Lake, SD Weather Forecast
Heap Lake, SD Weather Forecast Date: 206 AM CDT Sat Aug 22 2026
The area/counties/county of: Lyman, including the city of Kennebec.or toggle through each period.
Rest of Tonight... Mostly clear. Lows in the lower 60s. Northeast winds around 5 mph.
Saturday... Mostly sunny. Highs in the mid 80s. Northeast winds 5 to 10 mph.
Saturday Night... Partly cloudy in the evening, then mostly cloudy with a slight chance of thunderstorms after midnight. Lows in the lower 60s. East winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20%.
Sunday... Showers likely with a chance of thunderstorms. Breezy with highs in the lower 80s. Southeast winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 70%.
Sunday Night... Showers likely with a chance of thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Breezy with lows in the lower 60s. Southeast winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 70%.
Monday... Partly sunny. Highs in the mid 80s.
Monday Night... Partly cloudy. A 20% chance of thunderstorms. Lows in the mid 60s. Highs in the mid 80s.
Tuesday... Partly cloudy. A 20% chance of thunderstorms. Lows in the mid 60s. Highs in the mid 80s.
Tuesday Night... Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 60s.
Wednesday... Mostly clear. Highs in the mid 80s. Lows in the lower 60s.
Wednesday Night... Mostly clear. Highs in the mid 80s. Lows in the lower 60s.
Thursday... Partly sunny. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20%.
Thursday Night... Partly cloudy. A chance of thunderstorms, mainly in the evening. Lows in the lower 60s. Chance of rain 40%.
POP = Probability of Precipitation
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