10-Day Weather Forecast - Johnston, IA

Sunny. Highs in the mid 30s. Northwest winds 5 to 10 mph becoming southwest in the afternoon.

Mostly clear in the evening then becoming partly cloudy. Near steady temperature in the lower 30s. Southwest winds 5 to 10 mph.

Mostly sunny. Highs in the upper 40s. West winds 5 to 10 mph.

Mostly cloudy. Lows in the mid 30s. Southwest winds 5 to 10 mph.

Partly sunny. Highs in the mid 50s.

Mostly cloudy. Lows in the upper 20s.

Mostly cloudy in the morning then becoming mostly sunny. Much cooler. Near steady temperature around 30.

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

Partly sunny. A slight chance of snow in the afternoon. Highs around 40. Chance of snow 20 percent.

Mostly cloudy. A slight chance of rain and snow in the evening. Lows around 30. Chance of precipitation 20 percent.

Mostly cloudy. A slight chance of snow in the afternoon. Highs in the upper 30s. Chance of snow 20 percent.

Mostly cloudy. Lows 15 to 20.

Partly sunny. Highs in the upper 20s.

Mostly clear. Low temperature around 11F. Dew point will be around 4F with an average humidity of 64%. Winds will be 10 mph from the NW.

Sunny. High temperature around 18F. Dew point will be around 4F with an average humidity of 58%. Winds will be 8 mph from the NW.

Clear. Low temperature around 17F. Dew point will be around 8F with an average humidity of 64%. Winds will be 6 mph from the W.

Sunny. High temperature around 28F. Dew point will be around 14F with an average humidity of 62%. Winds will be 6 mph from the W.

Clear. Low temperature around 21F. Dew point will be around 15F with an average humidity of 70%. Winds will be 4 mph from the W.