10-Day Weather Forecast - Keystone, SD

Partly cloudy. Highs in the mid 40s. Northwest winds 5 to 10 mph with gusts up to 30 mph.

Clear. Lows in the mid 30s. Northwest winds 10 to 15 mph. Gusts up to 25 mph increasing to 35 mph after midnight.

Mostly sunny. Highs in the lower 40s. Temperature falling into the mid 30s in the afternoon. Northwest winds 10 to 20 mph with gusts up to 45 mph.

Mostly clear in the evening then becoming partly cloudy. Windy with lows 15 to 20. Northwest winds 25 to 35 mph with gusts up to 60 mph. Wind chill values near zero.

Partly cloudy and windy cooler with highs in the mid 20s.

Partly cloudy. Lows around 15.

Mostly sunny. Highs in the upper 30s.

Mostly clear. Lows in the mid 20s.

Mostly sunny. Highs in the lower 40s.

Mostly clear. Lows 15 to 20.

Mostly sunny. Highs in the upper 30s.

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 20s.

Partly cloudy. Highs in the mid 40s.

Mostly cloudy. Low temperature around 27F. Dew point will be around 12F with an average humidity of 46%. Winds will be 2 mph from the NW.

Partly cloudy. High temperature around 36F. Dew point will be around 13F with an average humidity of 45%. Winds will be 1 mph from the N.

Mostly cloudy with a slight chance of snow. Chance of precipitation 25%. Low temperature around 21F. Dew point will be around 13F with an average humidity of 64%. Winds will be 1 mph from the NE.

Cloudy with a slight chance of snow. Chance of precipitation 30%. High temperature around 27F. Dew point will be around 12F with an average humidity of 60%. Winds will be 3 mph from the E.

Cloudy with a chance of snow. Chance of precipitation 35%. Low temperature around 12F. Dew point will be around 10F with an average humidity of 79%. Winds will be 2 mph from the NE.