10-Day Weather Forecast - Johnston, IA

Mostly cloudy. Patchy drizzle. Highs in the mid 40s. Southeast winds around 5 mph.

Cloudy. Patchy fog in the evening then areas of fog after midnight. Lows in the mid 30s. Light and variable winds becoming north around 5 mph after midnight.

Cloudy. Patchy fog. Highs in the mid 40s. East winds 5 to 10 mph.

Mostly cloudy. A slight chance of rain in the evening. Near steady temperature in the lower 40s. Southeast winds 5 to 10 mph. Chance of rain 20 percent.

Mostly sunny. Highs in the lower 50s. West winds 5 to 10 mph.

Mostly cloudy. Lows in the upper 30s.

Mostly cloudy. Highs in the upper 50s.

Mostly cloudy. Cooler with lows in the mid 20s.

Partly sunny in the morning then clearing. Breezy and much cooler with highs in the lower 30s. Temperature falling into the mid 20s in the afternoon.

Mostly clear. Lows around 10 above.

Sunny. Highs in the lower 20s.

Partly cloudy in the evening then becoming mostly cloudy. Lows 10 to 15.

Mostly sunny. Highs in the mid 30s.

Clear. Low temperature around 28F. Dew point will be around 18F with an average humidity of 64%. Winds will be 7 mph from the SW.

Sunny. High temperature around 41F. Dew point will be around 24F with an average humidity of 60%. Winds will be 7 mph from the W.

Mostly clear. Low temperature around 30F. Dew point will be around 24F with an average humidity of 70%. Winds will be 3 mph from the SW.

Partly cloudy. High temperature around 40F. Dew point will be around 25F with an average humidity of 61%. Winds will be 5 mph from the S.

Mostly cloudy. Low temperature around 35F. Dew point will be around 30F with an average humidity of 78%. Winds will be 5 mph from the S.