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Folsom, SD Weather Forecast
Folsom, SD Weather Forecast Date: 122 AM MDT Sun Sep 20 2026
The area/counties/county of: Custer Co Plains, including the city of Folsom.or toggle through each period.
Overnight... Showers with a slight chance of thunderstorms. Areas of fog. Near steady temperature in the upper 50s. East winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 90%.
Sunday... Areas of fog in the morning. Showers. A slight chance of thunderstorms in the morning, then thunderstorms in the afternoon. Highs in the lower 60s. East winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90%.
Sunday Night... Showers with a slight chance of thunderstorms in the evening, then showers likely after midnight. Lows in the upper 40s. Northeast winds 10 to 15 mph. Gusts up to 25 mph in the evening.
Monday... Mostly cloudy. A chance of showers in the morning, then a slight chance of showers in the afternoon. Highs in the mid 60s. Northeast winds 5 to 10 mph. Gusts up to 25 mph in the afternoon. Chance of rain 40%.
Monday Night... Partly cloudy with a slight chance of showers in the evening, then mostly cloudy after midnight. Lows in the mid 40s. Southeast winds 10 to 15 mph. Gusts up to 25 mph in the evening. Chance of rain 20%.
Tuesday... Mostly cloudy. Highs in the lower 70s.
Tuesday Night... Partly cloudy. Lows in the lower 50s.
Wednesday... Partly cloudy. Highs in the lower 80s.
Wednesday Night... Partly cloudy. Lows in the lower 50s.
Thursday... Mostly sunny. Highs in the lower 80s.
Thursday Night... Mostly clear. Lows in the lower 50s.
Friday... Partly cloudy in the morning, then clearing. Highs in the lower 80s.
Friday Night... Partly cloudy in the evening, then clearing. Lows in the mid 50s.
POP = Probability of Precipitation
Folsom Radar Loop
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