TODAY MAR04
TEMPERATURE57
HUMIDITY39
PRESSURE29.93
WIND COND.360 16.6
  • 4730Fri
  • 4830Sat
  • 4729Sun
  • 5438Mon
  • 6242Tue
daynightWeather update from Norfolk, Naval Air Station at

Key findings

  • The highest monthly average temperature in Portsmouth for July is 81 degrees
  • The lowest monthly average temperature in Portsmouth for January is 43 degrees
  • The most monthly precipitation in Portsmouth occurs in August with 6.1 inches
  • The air quality index in Portsmouth is 20% better than the national average
  • The pollution index in Portsmouth is 53% better than the national average

Compare Portsmouth, VA Weather

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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
      January35°F53°F43°F3.1"
      February36°F54°F44°F2.5"
      March43°F62°F51°F3.5"
      April52°F72°F61°F3.5"
      May61°F79°F69°F4.2"
      June70°F87°F78°F4.9"
      July74°F90°F81°F4.8"
      August73°F88°F80°F6.1"
      September68°F83°F75°F5.7"
      October58°F74°F65°F5.5"
      November46°F64°F54°F3.3"
      December40°F57°F48°F3.5"

      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.
      IndexPortsmouthVirginiaNational
      Air quality index405850
      Pollution index2,392,3001,533,7925,066,862

      Portsmouth air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality317
      Days with moderate air quality48
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Portsmouth air quality information

      PollutantTotal
      Arsenic0.110%
      Benzene0.020%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.002%

      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.
      Carrollton, VA5,4814020%
      Chesapeake, VA233,1944020%
      Hampton, VA136,7894020%
      Norfolk, VA245,7244020%
      Portsmouth, VA96,0714020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Mission Viejo, CA96,1788978%
      Tuscaloosa, AL96,3523530%
      Vacaville, CA95,6073530%
      Dearborn, MI95,5205612%
      Lawton, OK96,7284314%
      Portsmouth, VA96,0714020%
      Source: The Portsmouth, VA 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.