TODAY OCT18
TEMPERATURE43
HUMIDITY97
PRESSURE29.97
WIND COND.
  • 5747Sat90%60%
  • 5649Sun70%40%
  • 6052Mon60%
  • 6145Tue
  • 5743Wed
daynightWeather update from Scappoose, Scappoose Industrial Airpark at
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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"

Did you know?

  • 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 56% better than the national average.
  • The pollution index in St. Helens is 36% better than the national average.

Compare St. Helens, OR Weather To Other Cities

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 index223250
Pollution index3,247,5805,374,5275,066,862

St. Helens air quality information

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

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.
Columbia City, OR2,1512256%
Deer Island, OR3752256%
Prescott, OR442256%
Woodland, WA5,6842256%
Rainier, OR1,9712256%
St. Helens, OR13,1692256%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Harrison, AR13,1683432%
Clayton, OH13,172484%
Streator, IL13,163198%
Soddy-Daisy, TN13,1624412%
Tehachapi, CA13,1797958%
St. Helens, OR13,1692256%
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.
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