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Sylvan Lake, SD Weather Forecast
Sylvan Lake, SD Weather Forecast Date: 527 AM MDT Sat Aug 01 2026
The area/counties/county of: Central Black Hills, including the cities of: Hill City, Mt Rushmore, Johnson Siding, Keystone, Rockerville, Hisega, Pactola Reservoir, Custer, Jewel Cave, and Custer State Park.or toggle through each period.
Today... Sunny. Highs in the lower 90s. Southwest winds 5 to 10 mph with gusts up to 25 mph.
Tonight... Clear in the evening, then becoming partly cloudy. Lows in the upper 60s. South winds 5 to 10 mph with gusts up to 30 mph.
Sunday... Mostly sunny. Highs in the mid 90s. Southwest winds 5 to 10 mph, becoming northeast in the afternoon. Gusts up to 30 mph.
Sunday Night... Mostly clear. Lows in the mid 60s. East winds 5 to 10 mph, becoming southwest after midnight. Gusts up to 25 mph.
Monday... Mostly sunny. Highs around 80. North winds 10 to 15 mph with gusts up to 35 mph.
Monday Night... Mostly clear in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows around 50. Chance of rain 30%.
Tuesday... Partly cloudy. A slight chance of showers in the morning. Highs in the upper 60s. Chance of rain 20%.
Tuesday Night... Mostly clear. A chance of showers after midnight. Lows around 50. Chance of rain 30%.
Wednesday... Partly cloudy. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 30%.
Wednesday Night... Mostly clear. Lows in the mid 50s.
Thursday... Mostly sunny. Highs in the mid 80s.
Thursday Night... Mostly clear. Lows in the lower 60s.
POP = Probability of Precipitation
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