Weather World
Heap Lake, SD 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Heap Lake, SD Weather Forecast
Heap Lake, SD Weather Forecast Date: 806 PM CDT Sat Aug 29 2026
The area/counties/county of: Lyman, including the city of Kennebec.or toggle through each period.
Tonight... Mostly cloudy with a slight chance of thunderstorms this evening, then partly cloudy with a slight chance of showers after midnight. Lows in the upper 60s. East winds 5 to 10 mph, becoming southeast after midnight. Chance of rain 20%.
Sunday... Partly sunny. Hot with highs in the lower 90s. Southwest winds 5 to 10 mph. Gusts up to 25 mph in the afternoon.
Sunday Night... Partly cloudy. Lows in the lower 60s. Southwest winds 10 to 15 mph, becoming northwest after midnight.
Monday... Partly sunny. Highs in the upper 80s. Northwest winds 5 to 10 mph, becoming east in the afternoon.
Monday Night... Mostly cloudy. A slight chance of thunderstorms after midnight. Lows in the mid 60s. Southeast winds 5 to 10 mph. Chance of rain 20%.
Tuesday... Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 60%.
Tuesday Night... Mostly cloudy with a chance of thunderstorms in the evening, then partly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 50%.
Wednesday... Partly sunny. Highs in the upper 80s.
Wednesday Night... Partly cloudy with a 20% chance of thunderstorms. Lows in the mid 60s.
Thursday... Partly sunny. Highs in the upper 80s.
Thursday Night... Mostly clear. Lows in the mid 60s.
Friday... Partly sunny. Hot with highs around 90.
Friday Night... Partly cloudy with a 20% chance of thunderstorms. Lows in the upper 60s.
POP = Probability of Precipitation
Heap Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...