10-Day Weather Forecast - Keystone, SD

Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northwest winds 5 to 10 mph. Gusts up to 20 mph in the afternoon. Chance of rain 40 percent.

Partly cloudy with a slight chance of showers and thunderstorms. Lows in the upper 50s. North winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 20 percent.

Partly cloudy. A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs in the upper 70s. North winds 5 to 10 mph. Chance of rain 60 percent.

Clear. A slight chance of showers and thunderstorms in the evening. Lows in the lower 50s. North winds 5 to 10 mph. Chance of rain 20 percent.

Mostly sunny in the morning, then partly cloudy with a chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.

Mostly clear. Lows in the mid 50s.

Partly cloudy. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 30 percent.

Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the upper 50s. Chance of rain 30 percent.

Partly cloudy in the morning, then mostly sunny with a slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.

Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the upper 50s. Chance of rain 20 percent.

Partly cloudy. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent.

Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the upper 50s. Chance of rain 20 percent.

Partly cloudy in the morning, then becoming mostly sunny. Highs in the lower 80s.

Partly cloudy with scattered thunderstorms. Chance of storms 35%. Low temperature around 58F. Dew point will be around 53F with an average humidity of 66%. Winds will be 3 mph from the W.

Sunny. High temperature around 80F. Dew point will be around 54F with an average humidity of 51%. Winds will be 4 mph from the SE.

Mostly clear. Low temperature around 58F. Dew point will be around 53F with an average humidity of 69%. Winds will be 4 mph from the W.

Sunny. High temperature around 79F. Dew point will be around 54F with an average humidity of 52%. Winds will be 3 mph from the SE.

Mostly clear with a slight chance of rain. Chance of precipitation 25%. Low temperature around 57F. Dew point will be around 52F with an average humidity of 69%. Winds will be 4 mph from the W.