10-Day Weather Forecast - Portsmouth, IA

Sunny. Much cooler with highs in the upper 20s. North winds around 20 mph diminishing to 10 to 15 mph in the afternoon.

Mostly clear in the evening then becoming partly cloudy. Lows around 15. North winds around 5 mph becoming west after midnight.

Partly sunny. Not as cool with highs in the upper 30s. Southwest winds 10 to 15 mph with gusts up to 25 mph.

Partly cloudy. Not as cool with lows in the upper 20s.

Partly sunny in the morning then becoming mostly cloudy. Brisk with highs in the lower 30s. Temperature falling into the mid 20s in the afternoon.

Mostly cloudy and brisk. Much colder with lows around 10 above. Wind chill values as low as 10 below after midnight.

Partly sunny. Much cooler with highs 15 to 20. Wind chill values as low as 10 below in the morning.

Partly cloudy. Cold with lows around 5 above. Wind chill values as low as 5 below after midnight.

Mostly sunny. Not as cool with highs in the lower 30s. Wind chill values as low as 5 below in the morning.

Partly cloudy. Lows around 10 above. Wind chill values as low as zero.

Mostly sunny. Highs in the mid 20s. Wind chill values as low as zero in the morning.

Mostly clear. Low temperature around 13F. Dew point will be around 5F with an average humidity of 66%. Winds will be 3 mph from the NW.

Mostly sunny. High temperature around 29F. Dew point will be around 10F with an average humidity of 59%. Winds will be 5 mph from the S.

Partly cloudy. Low temperature around 22F. Dew point will be around 16F with an average humidity of 71%. Winds will be 5 mph from the S.

Mostly sunny. High temperature around 29F. Dew point will be around 18F with an average humidity of 67%. Winds will be 2 mph from the N.

Partly cloudy. Low temperature around 21F. Dew point will be around 16F with an average humidity of 73%. Winds will be 3 mph from the NE.

Mostly cloudy. High temperature around 25F. Dew point will be around 17F with an average humidity of 73%. Winds will be 3 mph from the E.

Cloudy. Low temperature around 17F. Dew point will be around 17F with an average humidity of 84%. Winds will be 5 mph from the N.