Currently: 69 °F. Light rain. Overcast. (Weather station: Pease Air Force Base / Portsmouth, USA). See more current weatherAnnual 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