TODAY JAN20
TEMPERATURE46°F
HUMIDITY79%
PRESSURE30.15 inHg
WIND COND.190° 18.4 mph
  • 4739Sun100% | 60%
  • 4735Mon60% | 40%
  • 4841Tue70%
  • 4834Wed
  • 4334Thu
daynightWeather update from Salem - McNary Field, on 20 Jan 11:37 am PST

Monmouth Average Weather

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
January19°F64°F40°F6.0"
February18°F66°F42°F2.5"
March27°F73°F46°F3.5"
April27°F81°F49°F2.4"
May32°F99°F57°F2.4"
June38°F103°F61°F1.2"
July46°F108°F69°F0.3"
August43°F100°F68°F0.4"
September37°F96°F62°F1.2"
October27°F78°F52°F2.6"
November23°F70°F45°F7.2"
December10°F61°F39°F7.6"

Did you know?

  • The highest monthly average temperature in Monmouth for July is 69 degrees.
  • The lowest monthly average temperature in Monmouth for December is 39 degrees.
  • The most monthly precipitation in Monmouth occurs in December with 7.6 inches.
  • The air quality index in Monmouth is 37% better than the national average.
  • The pollution index in Monmouth is 37% better than the national average.

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Compare Monmouth, OR Weather To Other Cities

Monmouth 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.
IndexMonmouthOregonNational
Air quality index313250
Pollution index3,182,1805,436,2275,100,859

Monmouth air quality information

MeasurementTotal
Days measured361
Days with good air quality284
Days with moderate air quality72
Days w/ poor A.Q. for sensitive groups5
Days with unhealthy air quality

Monmouth air quality information

PollutantTotal
Arsenic0.010%
Benzene0.040%
Carbon Tetrachloride0.030%
Lead0.190%
Mercury0.110%

Average monthly Monmouth temperature with heat index

Monmouth monthly precipitation with daily maximum

Monmouth monthly snow depth with daily maximum

Monmouth monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Kings Valley, OR571766%
Adair Village, OR8812354%
Marion, OR1752354%
Jefferson, OR3,1522354%
Millersburg, OR1,7712354%
Monmouth, OR9,7693138%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Washington, NC9,768394%
Waynesville, NC9,7704020%
Cottage Grove, OR9,7723628%
East Stroudsburg, PA9,7733922%
Baker City, OR9,7743334%
Monmouth, OR9,7693138%
Source: The Monmouth, 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.