TODAY FEB26
TEMPERATURE45
HUMIDITY80
PRESSURE30.25
WIND COND.220 7.6
  • 4636Fri90%60%
  • 4939Sat20%
  • 5037Sun
  • 4935Mon
  • 5036Tue
daynightWeather update from Scappoose, Scappoose Industrial Airpark at

Key findings

  • The highest monthly average temperature in St. Helens for August is 68 degrees
  • The lowest monthly average temperature in St. Helens for December is 38 degrees
  • The most monthly precipitation in St. Helens occurs in November with 7.1 inches
  • The air quality index in St. Helens is 64% better than the national average
  • The pollution index in St. Helens is 36% better than the national average

Compare St. Helens, OR Weather

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      St. Helens 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
      January32°F47°F38°F6.1"
      February34°F52°F42°F4.6"
      March37°F57°F46°F5.7"
      April39°F62°F50°F3.1"
      May45°F70°F57°F2.5"
      June50°F75°F62°F1.4"
      July54°F83°F68°F0.3"
      August54°F84°F68°F0.5"
      September49°F78°F62°F1.6"
      October43°F65°F53°F4.1"
      November37°F53°F45°F7.1"
      December32°F45°F38°F6.9"

      St. Helens 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.
      IndexSt. HelensOregonNational
      Air quality index183250
      Pollution index3,247,5805,374,5275,066,862

      St. Helens air quality information

      MeasurementTotal
      Days measured360
      Days with good air quality338
      Days with moderate air quality22
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      St. Helens air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.020%
      Carbon Tetrachloride0.500%
      Lead0.040%
      Mercury0.001%

      Average monthly St. Helens temperature with heat index

      St. Helens monthly precipitation with daily maximum

      St. Helens monthly snow depth with daily maximum

      St. Helens monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Deer Island, OR3751864%
      Prescott, OR441864%
      Kalama, WA2,5961864%
      Woodland, WA5,6841864%
      Rainier, OR1,9711864%
      St. Helens, OR13,1691864%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Harrison, AR13,1683628%
      Clayton, OH13,172476%
      Streator, IL13,1630100%
      Soddy-Daisy, TN13,162468%
      Tehachapi, CA13,1796734%
      St. Helens, OR13,1691864%
      Source: The St. Helens, 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.