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Climate & Weather Averages in Portsmouth, New Hampshire, USA

Currently: 45 °F. Fog. (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 1992–2021.

All Year Climate & Weather Averages in Portsmouth

High Temp: 81 °F

Low Temp: 18 °F

Mean Temp: 49 °F

Precipitation: 3.78"

Humidity: 70%

Dew Point: 39 °F

Wind: 14 mph

Pressure: 30.00 "Hg

Visibility: 12 mi

January Climate & Weather Averages in Portsmouth

High Temp: 34 °F

Low Temp: 18 °F

Mean Temp: 26 °F

Precipitation: 3.25"

Humidity: 69%

Dew Point: 17 °F

Wind: 16 mph

Pressure: 30.00 "Hg

Visibility: 12 mi

February Climate & Weather Averages in Portsmouth

High Temp: 36 °F

Low Temp: 20 °F

Mean Temp: 28 °F

Precipitation: 3.27"

Humidity: 66%

Dew Point: 17 °F

Wind: 16 mph

Pressure: 29.99 "Hg

Visibility: 13 mi

March Climate & Weather Averages in Portsmouth

High Temp: 43 °F

Low Temp: 27 °F

Mean Temp: 35 °F

Precipitation: 4.08"

Humidity: 65%

Dew Point: 23 °F

Wind: 17 mph

Pressure: 30.00 "Hg

Visibility: 13 mi

April Climate & Weather Averages in Portsmouth

High Temp: 55 °F

Low Temp: 37 °F

Mean Temp: 46 °F

Precipitation: 4.06"

Humidity: 64%

Dew Point: 32 °F

Wind: 16 mph

Pressure: 29.96 "Hg

Visibility: 13 mi

May Climate & Weather Averages in Portsmouth

High Temp: 66 °F

Low Temp: 47 °F

Mean Temp: 56 °F

Precipitation: 3.60"

Humidity: 69%

Dew Point: 44 °F

Wind: 14 mph

Pressure: 29.98 "Hg

Visibility: 13 mi

June Climate & Weather Averages in Portsmouth

High Temp: 75 °F

Low Temp: 56 °F

Mean Temp: 66 °F

Precipitation: 4.02"

Humidity: 73%

Dew Point: 55 °F

Wind: 13 mph

Pressure: 29.93 "Hg

Visibility: 11 mi

July Climate & Weather Averages in Portsmouth

High Temp: 81 °F

Low Temp: 62 °F

Mean Temp: 72 °F

Precipitation: 4.13"

Humidity: 74%

Dew Point: 61 °F

Wind: 12 mph

Pressure: 29.94 "Hg

Visibility: 11 mi

August Climate & Weather Averages in Portsmouth

High Temp: 80 °F

Low Temp: 61 °F

Mean Temp: 70 °F

Precipitation: 3.11"

Humidity: 74%

Dew Point: 61 °F

Wind: 11 mph

Pressure: 29.99 "Hg

Visibility: 12 mi

September Climate & Weather Averages in Portsmouth

High Temp: 72 °F

Low Temp: 54 °F

Mean Temp: 63 °F

Precipitation: 3.61"

Humidity: 76%

Dew Point: 54 °F

Wind: 12 mph

Pressure: 30.05 "Hg

Visibility: 12 mi

October Climate & Weather Averages in Portsmouth

High Temp: 61 °F

Low Temp: 43 °F

Mean Temp: 52 °F

Precipitation: 4.49"

Humidity: 74%

Dew Point: 43 °F

Wind: 14 mph

Pressure: 30.03 "Hg

Visibility: 13 mi

November Climate & Weather Averages in Portsmouth

High Temp: 49 °F

Low Temp: 33 °F

Mean Temp: 41 °F

Precipitation: 3.69"

Humidity: 70%

Dew Point: 31 °F

Wind: 14 mph

Pressure: 30.05 "Hg

Visibility: 13 mi

December Climate & Weather Averages in Portsmouth

High Temp: 39 °F

Low Temp: 24 °F

Mean Temp: 32 °F

Precipitation: 4.03"

Humidity: 72%

Dew Point: 23 °F

Wind: 15 mph

Pressure: 30.02 "Hg

Visibility: 12 mi

Quick Climate Info

Hottest MonthJuly (72 °F avg)
Coldest MonthJanuary (26 °F avg)
Wettest MonthOctober (4.49" avg)
Windiest MonthMarch (17 mph avg)
Annual precip.45.34" (per year)

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