10-Day Weather Forecast - Portsmouth, IA

Widespread frost in the morning. Sunny. Highs in the mid 60s. West winds 5 to 10 mph.

Mostly clear in the evening then becoming partly cloudy. Not as cool with lows in the mid 40s. Southwest winds 5 to 10 mph.

Partly sunny. Highs in the lower 70s. Southwest winds 5 to 10 mph becoming northwest in the afternoon.

Partly cloudy in the evening then clearing. Lows in the mid 40s.

Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 20 percent.

Mostly cloudy with a 20 percent chance of showers. Lows in the lower 40s.

Partly sunny with a chance of showers in the morning then mostly cloudy with a slight chance of showers in the afternoon. Much cooler with highs in the lower 60s. Chance of rain 30 percent.

Mostly cloudy. A chance of showers in the evening then a slight chance of showers and thunderstorms after midnight. Lows in the upper 30s. Chance of rain 30 percent.

Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 50s. Chance of rain 20 percent.

Mostly cloudy in the evening then clearing. Lows in the mid 30s.

Sunny. Highs in the mid 60s.

Mostly clear. Low temperature around 45F. Dew point will be around 35F with an average humidity of 56%. Winds will be 5 mph from the S.

Sunny. High temperature around 70F. Dew point will be around 42F with an average humidity of 54%. Winds will be 6 mph from the NW.

Clear. Low temperature around 47F. Dew point will be around 41F with an average humidity of 58%. Winds will be 4 mph from the NW.

Mostly sunny. High temperature around 66F. Dew point will be around 43F with an average humidity of 59%. Winds will be 4 mph from the NW.

Partly cloudy. Low temperature around 47F. Dew point will be around 43F with an average humidity of 64%. Winds will be 2 mph from the NE.

Mostly sunny with a slight chance of rain. Chance of precipitation 25%. High temperature around 67F. Dew point will be around 45F with an average humidity of 64%. Winds will be 2 mph from the NE.

Clear. Low temperature around 48F. Dew point will be around 44F with an average humidity of 65%. Winds will be 1 mph from the NW.