TODAY APR07
TEMPERATURE58
HUMIDITY
PRESSURE29.83
WIND COND.300 10.3
  • 4537Wed40%
  • 4636Thu60%60%
  • 4834Fri
  • 4934Sat
  • 5441Sun40%
daynightWeather update from Pease Air Force Base / Portsmouth at
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Portsmouth Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January19°F36°F27°F5.3"
February19°F37°F27°F6.2"
March27°F45°F35°F7.3"
April37°F58°F47°F7.5"
May47°F68°F57°F7.1"
June56°F76°F65°F8.3"
July63°F83°F72°F7.9"
August60°F81°F70°F8.4"
September54°F74°F63°F8.5"
October43°F63°F52°F8.2"
November33°F52°F42°F6.9"
December24°F41°F32°F6.3"

Did you know?

  • The highest monthly average temperature in Portsmouth for July is 72 degrees.
  • The lowest monthly average temperature in Portsmouth for January is 27 degrees.
  • The most monthly precipitation in Portsmouth occurs in September with 8.5 inches.
  • The air quality index in Portsmouth is 28% better than the national average.
  • The pollution index in Portsmouth is 98% better than the national average.

Compare Portsmouth, NH Weather To Other Cities

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      Portsmouth air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexPortsmouthNew HampshireNational
      Air quality index363450
      Pollution index91,7903,853,7475,066,862

      Portsmouth air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality327
      Days with moderate air quality38
      Days w/ poor A.Q. for sensitive groups
      Days with unhealthy air quality

      Portsmouth air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.002%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.000%

      Average monthly Portsmouth temperature with heat index

      Portsmouth monthly precipitation with daily maximum

      Portsmouth monthly snow depth with daily maximum

      Portsmouth monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Berwick, ME2,3292648%
      Hampton, NH9,5423628%
      Seabrook Beach, NH9583628%
      Kittery, ME4,7043628%
      Dover, NH30,7503628%
      Portsmouth, NH21,4583628%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Arbutus, MD21,455468%
      Palm Valley, FL21,4413824%
      Sedalia, MO21,441375650%
      Albertville, AL21,4343530%
      Lakeside, CA21,4886122%
      Portsmouth, NH21,4583628%
      Source: The Portsmouth, NH weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.