TODAY JAN18
TEMPERATURE38
HUMIDITY89
PRESSURE30.51
WIND COND.340 7.6
  • 4832Tue
  • 4736Wed
  • 4535Thu20%
  • 4531Fri
  • 4334Sat
daynightWeather update from Pearson Airfield at

Key findings

  • The highest monthly average temperature in Northwest for August is 69 degrees
  • The lowest monthly average temperature in Northwest for December is 40 degrees
  • The most monthly precipitation in Northwest occurs in November with 6.2 inches
  • The air quality index in Northwest is 24% better than the national average
  • The pollution index in Northwest is 63% better than the national average

Compare Vancouver, WA Weather

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      Northwest 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°F5.4"
      February36°F52°F43°F3.7"
      March39°F57°F47°F4.9"
      April42°F63°F52°F2.9"
      May48°F71°F58°F2.6"
      June53°F76°F63°F1.7"
      July57°F84°F69°F0.5"
      August57°F84°F69°F0.4"
      September52°F79°F64°F1.5"
      October46°F66°F55°F3.7"
      November40°F54°F47°F6.2"
      December34°F47°F40°F6.2"

      Northwest 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.
      IndexNorthwestVancouverWashington
      Air quality index383836
      Pollution index1,899,4101,899,4108,596,989

      Northwest air quality information

      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

      Northwest air quality information

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

      Average monthly Northwest temperature with heat index

      Northwest monthly precipitation with daily maximum

      Northwest monthly snow depth with daily maximum

      Northwest monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      St. Helens, OR13,1691864%
      Maywood Park, OR9393824%
      Brush Prairie, WA2,6463824%
      Lewisville, WA1,8383824%
      Yacolt, WA1,8143824%
      Vancouver, WA169,9823824%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Cape Coral, FL170,0633628%
      Ontario, CA169,3898978%
      Jackson, MS172,0394412%
      Sioux Falls, SD167,8843628%
      Santa Rosa, CA173,1653432%
      Vancouver, WA169,9823824%
      Source: The Northwest, Vancouver, WA 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.