TODAY JUL23
TEMPERATURE67
HUMIDITY100
PRESSURE30.18
WIND COND.
  • 7468Mon30%
  • 7668Tue
  • 7769Wed30%60%
  • 7567Thu90%90%
  • 7967Fri70%50%
daynightWeather update from Portland, Portland International Jetport at

Portland 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
January-16°F67°F25°F3.0"
February-6°F51°F25°F4.3"
March-6°F64°F33°F3.4"
April22°F90°F45°F5.7"
May29°F92°F54°F5.4"
June39°F94°F63°F6.2"
July49°F93°F69°F5.4"
August43°F95°F68°F4.0"
September34°F92°F61°F4.4"
October25°F81°F50°F7.7"
November14°F70°F41°F5.7"
December-1°F68°F30°F4.3"

Did you know?

  • The highest monthly average temperature in Portland for July is 69 degrees.
  • The lowest monthly average temperature in Portland for January is 25 degrees.
  • The most monthly precipitation in Portland occurs in October with 7.7 inches.
  • The air quality index in Portland is 23% better than the national average.
  • The pollution index in Portland is 59% better than the national average.

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Compare Portland, ME Weather To Other Cities

Portland 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.
IndexPortlandMaineNational
Air quality index383350
Pollution index2,043,7002,555,8535,066,862

Portland air quality information

MeasurementTotal
Days measured365
Days with good air quality287
Days with moderate air quality74
Days w/ poor A.Q. for sensitive groups4
Days with unhealthy air quality

Portland air quality information

PollutantTotal
Arsenic0.030%
Benzene0.020%
Carbon Tetrachloride0.003%
Lead0.030%
Mercury0.002%

Average monthly Portland temperature with heat index

Portland monthly precipitation with daily maximum

Portland monthly snow depth with daily maximum

Portland monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Falmouth, ME2,0183824%
Little Falls, ME6353824%
Saco, ME19,0083824%
Standish, ME4573824%
Biddeford, ME21,3413824%
Portland, ME66,6493824%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Palo Alto, CA66,649484%
Camarillo, CA66,630484%
Woodbury, MN66,6994412%
South San Francisco, CA66,5874314%
Oshkosh, WI66,7133628%
Portland, ME66,6493824%
Source: The Portland, ME 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.