10-Day Weather Forecast - Keystone, SD

Mostly sunny in the morning then partly cloudy with a slight chance of snow in the afternoon. Highs in the mid 40s. West winds 10 to 15 mph with gusts up to 25 mph. Chance of snow 20 percent.

Mostly cloudy with a 50 percent chance of snow. Snow accumulation up to 1 inch possible. Much cooler with lows 5 to 10 above. Northwest winds 10 to 15 mph with gusts up to 30 mph. Wind chill values around 5 below after midnight.

Partly cloudy in the morning then clearing. Much cooler with highs 15 to 20. Northwest winds 10 to 15 mph with gusts up to 40 mph. Wind chill values around 10 below.

Clear. Near steady temperature around 10. Northwest winds 10 to 15 mph with gusts up to 30 mph. Wind chill values around 5 below.

Sunny. Not as cool with highs in the mid 30s.

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

Becoming partly cloudy. Highs in the lower 40s.

Partly cloudy. Lows in the mid 20s.

Partly cloudy. A slight chance of snow in the afternoon. Highs in the lower 40s. Temperature falling into the lower 30s in the afternoon. Chance of snow 20 percent.

Partly cloudy. A slight chance of snow in the evening. Lows 15 to 20. Chance of snow 20 percent.

Partly cloudy. Highs in the mid 30s.

Partly cloudy. Lows in the lower 20s.

Partly cloudy. Highs in the lower 40s.

Partly cloudy. Low temperature around 33F. Dew point will be around 22F with an average humidity of 57%. Winds will be 5 mph from the W.

Mostly sunny. High temperature around 45F. Dew point will be around 19F with an average humidity of 42%. Winds will be 3 mph from the W.

Clear with a slight chance of rain-snow mix. Chance of precipitation 25%. Low temperature around 29F. Dew point will be around 20F with an average humidity of 61%. Winds will be 4 mph from the W.

Mostly sunny. High temperature around 41F. Dew point will be around 19F with an average humidity of 49%. Winds will be 2 mph from the W.

Mostly cloudy. Low temperature around 28F. Dew point will be around 19F with an average humidity of 65%. Winds will be 3 mph from the W.