10-Day Weather Forecast - Keystone, SD

Mostly sunny. Highs in the upper 20s. Northwest winds 10 to 15 mph with gusts up to 25 mph. Wind chill values around 5 below in the morning.

Partly cloudy. Lows 15 to 20. West winds 5 to 10 mph. Gusts up to 30 mph decreasing to 20 mph after midnight.

Partly cloudy. A slight chance of snow in the morning then a chance of snow in the afternoon. Little or no snow accumulation. Highs in the mid 30s. Temperature falling into the upper 20s in the afternoon. West winds 10 to 15 mph. Gusts up to 30 mph increasing to 40 mph in the afternoon. Chance of snow 40 percent.

Partly cloudy. A slight chance of snow in the evening. Lows 15 to 20. Northwest winds 10 to 15 mph with gusts up to 40 mph. Chance of snow 20 percent.

Partly cloudy with a slight chance of snow in the morning then mostly sunny in the afternoon. Highs in the mid 20s. Temperature falling in the afternoon. Chance of snow 20 percent.

Mostly clear. Lows around 10.

Partly cloudy. Highs in the mid 30s.

Mostly cloudy. A slight chance of snow after midnight. Lows 5 to 10 above. Chance of snow 20 percent.

Mostly cloudy. A slight chance of snow in the morning then a chance of snow in the afternoon. Highs around 20. Chance of snow 30 percent.

Mostly cloudy with a 40 percent chance of snow. Lows zero to 5 above.

Becoming partly cloudy. A 30 percent chance of snow. Highs 15 to 20.

Partly cloudy. A slight chance of snow in the evening. Lows zero to 5 above. Chance of snow 20 percent.

Partly cloudy. Highs in the mid 20s.

Partly cloudy. Low temperature around 18F. Dew point will be around 8F with an average humidity of 63%. Winds will be 3 mph from the W.

Partly cloudy. High temperature around 33F. Dew point will be around 12F with an average humidity of 50%. Winds will be 3 mph from the NW.

Mostly cloudy. Low temperature around 20F. Dew point will be around 11F with an average humidity of 64%. Winds will be 4 mph from the NW.

Mostly cloudy. High temperature around 32F. Dew point will be around 12F with an average humidity of 52%. Winds will be 4 mph from the N.

Clear. Low temperature around 19F. Dew point will be around 11F with an average humidity of 63%. Winds will be 4 mph from the NW.