TODAY SEP18
TEMPERATURE54
HUMIDITY80
PRESSURE30.11
WIND COND.50 5.8
  • 6750Wed
  • 6751Thu20%30%
  • 6854Fri50%
  • 6650Sat
  • 6549Sun
daynightWeather update from Pearson Airfield at
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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°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"

Did you know?

  • The highest monthly average temperature in Northwest for August is 70 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 23% better than the national average.
  • The pollution index in Northwest is 35% better than the national average.

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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.
IndexNorthwestPortlandOregon
Air quality index383832
Pollution index3,247,5801,899,4105,374,527

Northwest air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality108
Days w/ poor A.Q. for sensitive groups12
Days with unhealthy air quality4

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.
Bethany, OR22,8193824%
Damascus, OR10,8423824%
Gladstone, OR11,8503824%
Jennings Lodge, OR7,7273824%
Maywood Park, OR9393824%
Portland, OR620,5893824%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Baltimore, MD621,000468%
Oklahoma City, OK620,015476%
Las Vegas, NV613,295548%
Louisville, KY611,5735510%
Milwaukee, WI598,6724510%
Portland, OR620,5893824%
Source: The Northwest, 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.