Home   Weather   USA   Portsmouth   Climate
Flag for USA

Climate & Weather Averages in Portsmouth, New Hampshire, USA

Currently: 67 °F. Passing clouds. (Weather station: Pease Air Force Base / Portsmouth, USA). See more current weather

Annual Weather Averages Near Portsmouth

Averages are for Pease Air Force Base / Portsmouth, which is 3 miles from Portsmouth.

Based on weather reports collected during 1985–2015.

All Year Climate & Weather Averages in Portsmouth

High Temp: 81 °F

Low Temp: 18 °F

Mean Temp: 49 °F

Precipitation: 2.07"

Humidity: 70%

Dew Point: 38 °F

Wind: 8 mph

Pressure: 30.00 "Hg

Visibility: 15 mi

January Climate & Weather Averages in Portsmouth

High Temp: 34 °F

Low Temp: 18 °F

Mean Temp: 26 °F

Precipitation: 2.13"

Humidity: 69%

Dew Point: 16 °F

Wind: 8 mph

Pressure: 30.00 "Hg

Visibility: 15 mi

February Climate & Weather Averages in Portsmouth

High Temp: 35 °F

Low Temp: 19 °F

Mean Temp: 27 °F

Precipitation: 1.82"

Humidity: 65%

Dew Point: 16 °F

Wind: 9 mph

Pressure: 29.99 "Hg

Visibility: 16 mi

March Climate & Weather Averages in Portsmouth

High Temp: 43 °F

Low Temp: 27 °F

Mean Temp: 35 °F

Precipitation: 2.35"

Humidity: 65%

Dew Point: 24 °F

Wind: 9 mph

Pressure: 30.00 "Hg

Visibility: 15 mi

April Climate & Weather Averages in Portsmouth

High Temp: 55 °F

Low Temp: 37 °F

Mean Temp: 46 °F

Precipitation: 2.20"

Humidity: 64%

Dew Point: 33 °F

Wind: 8 mph

Pressure: 29.96 "Hg

Visibility: 16 mi

May Climate & Weather Averages in Portsmouth

High Temp: 65 °F

Low Temp: 47 °F

Mean Temp: 56 °F

Precipitation: 2.14"

Humidity: 70%

Dew Point: 45 °F

Wind: 7 mph

Pressure: 29.98 "Hg

Visibility: 15 mi

June Climate & Weather Averages in Portsmouth

High Temp: 75 °F

Low Temp: 56 °F

Mean Temp: 65 °F

Precipitation: 2.43"

Humidity: 73%

Dew Point: 55 °F

Wind: 7 mph

Pressure: 29.93 "Hg

Visibility: 14 mi

July Climate & Weather Averages in Portsmouth

High Temp: 81 °F

Low Temp: 62 °F

Mean Temp: 71 °F

Precipitation: 2.12"

Humidity: 74%

Dew Point: 61 °F

Wind: 6 mph

Pressure: 29.94 "Hg

Visibility: 13 mi

August Climate & Weather Averages in Portsmouth

High Temp: 80 °F

Low Temp: 61 °F

Mean Temp: 70 °F

Precipitation: 1.61"

Humidity: 74%

Dew Point: 61 °F

Wind: 6 mph

Pressure: 29.99 "Hg

Visibility: 14 mi

September Climate & Weather Averages in Portsmouth

High Temp: 71 °F

Low Temp: 53 °F

Mean Temp: 62 °F

Precipitation: 1.72"

Humidity: 77%

Dew Point: 54 °F

Wind: 6 mph

Pressure: 30.05 "Hg

Visibility: 15 mi

October Climate & Weather Averages in Portsmouth

High Temp: 60 °F

Low Temp: 42 °F

Mean Temp: 51 °F

Precipitation: 1.87"

Humidity: 73%

Dew Point: 42 °F

Wind: 7 mph

Pressure: 30.03 "Hg

Visibility: 15 mi

November Climate & Weather Averages in Portsmouth

High Temp: 49 °F

Low Temp: 33 °F

Mean Temp: 41 °F

Precipitation: 2.15"

Humidity: 70%

Dew Point: 32 °F

Wind: 8 mph

Pressure: 30.05 "Hg

Visibility: 15 mi

December Climate & Weather Averages in Portsmouth

High Temp: 39 °F

Low Temp: 24 °F

Mean Temp: 32 °F

Precipitation: 2.32"

Humidity: 71%

Dew Point: 23 °F

Wind: 8 mph

Pressure: 30.02 "Hg

Visibility: 15 mi

Quick Climate Info

Hottest MonthJuly (71 °F avg)
Coldest MonthJanuary (26 °F avg)
Wettest MonthJune (2.43" avg)
Windiest MonthMarch (9 mph avg)
Annual precip.24.85" (per year)

Weather by CustomWeather, © 2021