10-Day Weather Forecast - Portsmouth, NH

Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Warm with highs in the upper 80s. Light and variable winds. Chance of rain 20 percent. Heat index values in the mid 90s in the afternoon.

Partly cloudy. Humid with lows in the upper 60s. Light and variable winds. Heat index values in the lower 90s early in the evening.

Partly sunny. Showers likely with a chance of thunderstorms in the afternoon. Warm with highs in the mid 80s. Light and variable winds. Chance of rain 70 percent. Heat index values in the lower 90s.

Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the mid 60s. Chance of rain 50 percent.

Partly sunny. Highs in the lower 80s.

Mostly clear. Lows in the lower 60s.

Mostly sunny. Highs in the lower 80s.

Mostly clear. Lows in the lower 60s.

Mostly sunny. Warm with highs in the upper 80s.

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 60s.

Mostly sunny. Hot with highs in the lower 90s.

Mostly clear with a slight chance of rain. Chance of precipitation 25%. Low temperature around 72F. Dew point will be around 65F with an average humidity of 63%. Winds will be 8 mph from the SW.

Mostly sunny with a 30% chance for rain and thunderstorms. High temperature around 85F. Dew point will be around 65F with an average humidity of 60%. Winds will be 7 mph from the W.

Mostly clear with a 35% chance for rain and thunderstorms. Low temperature around 67F. Dew point will be around 63F with an average humidity of 70%. Winds will be 4 mph from the W.

Mostly sunny with a slight chance of rain. Chance of precipitation 25%. High temperature around 81F. Dew point will be around 62F with an average humidity of 62%. Winds will be 3 mph from the W.

Mostly clear with a slight chance of rain. Chance of precipitation 30%. Low temperature around 67F. Dew point will be around 62F with an average humidity of 76%. Winds will be 3 mph from the SW.

Mostly sunny. High temperature around 80F. Dew point will be around 61F with an average humidity of 62%. Winds will be 2 mph from the NW.

Clear. Low temperature around 66F. Dew point will be around 60F with an average humidity of 72%. Winds will be 3 mph from the W.