St. Helens, OR Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in St. Helens for August is 68 degrees
The lowest monthly average temperature in St. Helens for December is 38.1 degrees
The most monthly precipitation in St. Helens occurs in November with 7.1 inches
The air quality index in St. Helens is 57% better than the national average
The pollution index in St. Helens is 19% worse than the national average

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	32°F	47°F	38°F	6.1"
February	34°F	52°F	42°F	4.6"
March	37°F	57°F	46°F	5.7"
April	39°F	62°F	50°F	3.1"
May	45°F	70°F	57°F	2.5"
June	50°F	75°F	62°F	1.4"
July	54°F	83°F	68°F	0.3"
August	54°F	84°F	68°F	0.5"
September	49°F	78°F	62°F	1.6"
October	43°F	65°F	53°F	4.1"
November	37°F	53°F	45°F	7.1"
December	32°F	45°F	38°F	6.9"

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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.
Index	St. Helens	Oregon	National
Air quality index	18	32	42
Pollution index	3,247,580	7,156,356	2,726,193

St. Helens air quality

Measurement	Total
Days measured	360
Days with good air quality	338
Days with moderate air quality	22
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.002%
Benzene	0.020%
Carbon Tetrachloride	0.500%
Lead	0.040%
Mercury	0.001%

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	Population	Air Quality Index	National Avg.
Deer Island, OR	105	18	64.0%
Prescott, OR	85	18	64.0%
Kalama, WA	2,708	18	64.0%
Woodland, WA	6,223	18	64.0%
Rainier, OR	2,080	18	64.0%
St. Helens, OR	13,779	18	64.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Lockhart, TX	13,782	44	12.0%
Wood Dale, IL	13,783	55	10.0%
Royse City, TX	13,773	51	2.0%
Jefferson Valley-Yorktown, NY	13,786	36	28.0%
Bridgetown, OH	13,786	54	8.0%
St. Helens, OR	13,779	18	64.0%

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.