TODAY DEC04
TEMPERATURE27
HUMIDITY92
PRESSURE102740
WIND COND.
  • 4834
  • 4838Thu
  • 5144Fri50%
  • 5242Sat100%
  • 5039Sun
daynightWeather update from Pearson Airfield at
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Weather Quick Facts

  • The highest monthly average temperature in Portsmith for August is 69.5 degrees
  • The lowest monthly average temperature in Portsmith for December is 39.9 degrees
  • The most monthly precipitation in Portsmith occurs in November with 6.2 inches
  • The air quality index in Portsmith is 10% better than the national average
  • The pollution index in Portsmith is 19% worse than the national average

Compare Portland, OR Weather

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      Portsmith 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
      January34°F48°F40°F4.9"
      February36°F53°F43°F3.4"
      March39°F58°F48°F4.8"
      April42°F63°F52°F3.0"
      May48°F71°F58°F2.8"
      June53°F76°F63°F1.7"
      July57°F84°F69°F0.5"
      August58°F85°F70°F0.5"
      September53°F78°F64°F1.8"
      October47°F66°F55°F3.7"
      November40°F55°F47°F6.2"
      December34°F47°F40°F6.2"

      Portsmith 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.
      IndexPortsmithPortlandOregon
      Air quality index383832
      Pollution index3,247,5801,899,4107,156,356

      Portsmith air quality

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.003%
      Benzene0.020%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.002%

      Average monthly Portsmith temperature with heat index

      Portsmith monthly precipitation with daily maximum

      Portsmith monthly snow depth with daily maximum

      Portsmith monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Gresham, OR110,4563824.0%
      Brush Prairie, WA2,7213824.0%
      Orchards, WA26,2893824.0%
      Durham, OR1,7643824.0%
      Jennings Lodge, OR8,5003824.0%
      Portland, OR650,3803824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Memphis, TN650,9104510.0%
      Oklahoma City, OK649,821484.0%
      Las Vegas, NV644,594548.0%
      Nashville, TN667,0704510.0%
      Detroit, MI672,3515612.0%
      Portland, OR650,3803824.0%
      Source: The Portsmith, Portland, OR 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.