10-Day Weather Forecast - Keystone, SD

Partly cloudy. A chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. North winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 40 percent.

Partly cloudy in the evening then becoming mostly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 50s. Northeast winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 20 percent.

Mostly cloudy in the morning then partly cloudy with showers and thunderstorms likely in the afternoon. Highs in the lower 80s. East winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 70 percent.

Mostly cloudy with showers and thunderstorms likely in the evening then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 50s. North winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 70 percent.

Partly cloudy. Showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 70 percent.

Partly cloudy. Showers likely with a chance of thunderstorms in the evening then a slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 60 percent.

Mostly cloudy with a slight chance of showers and thunderstorms in the morning then partly cloudy with showers with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 80 percent.

Partly cloudy with a chance of showers and thunderstorms in the evening then mostly clear after midnight. Lows in the mid 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 around 80. Chance of rain 20 percent.

Mostly clear. Lows around 60.

Mostly sunny. Highs around 90.

Clear. Lows in the mid 60s.

Mostly sunny. Highs in the lower 90s.

Clear. Low temperature around 65F. Dew point will be around 49F with an average humidity of 42%. Winds will be 3 mph from the W.

Sunny. High temperature around 92F. Dew point will be around 51F with an average humidity of 32%. Winds will be 5 mph from the E.

Clear. Low temperature around 64F. Dew point will be around 50F with an average humidity of 44%. Winds will be 4 mph from the W.

Mostly sunny. High temperature around 91F. Dew point will be around 52F with an average humidity of 35%. Winds will be 4 mph from the E.

Mostly clear. Low temperature around 63F. Dew point will be around 53F with an average humidity of 51%. Winds will be 2 mph from the NW.