TODAY SEP19
TEMPERATURE58
HUMIDITY44
PRESSURE30.04
WIND COND.340 14.8
  • 6139Sat
  • 5943Sun
  • 6147Mon
  • 6454Tue
  • 7154Wed
daynightWeather update from Portland, Portland International Jetport at

Key findings

  • The highest monthly average temperature in Downtown for July is 70 degrees
  • The lowest monthly average temperature in Downtown for January is 25 degrees
  • The most monthly precipitation in Downtown occurs in October with 6.9 inches
  • The air quality index in Downtown is 20% better than the national average
  • The pollution index in Downtown is 60% better than the national average

Compare Portland, ME Weather

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      Downtown 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
      January15°F36°F25°F3.2"
      February15°F37°F26°F4.2"
      March24°F44°F34°F4.0"
      April34°F57°F45°F5.0"
      May44°F67°F55°F4.5"
      June53°F75°F63°F5.8"
      July60°F82°F70°F4.3"
      August58°F80°F69°F4.4"
      September51°F74°F62°F4.1"
      October41°F62°F51°F6.9"
      November31°F52°F41°F4.4"
      December21°F40°F30°F5.3"

      Downtown 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.
      IndexDowntownPortlandMaine
      Air quality index404033
      Pollution index2,043,7002,043,7002,555,853

      Downtown air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality308
      Days with moderate air quality56
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Downtown air quality information

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

      Average monthly Downtown temperature with heat index

      Downtown monthly precipitation with daily maximum

      Downtown monthly snow depth with daily maximum

      Downtown monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Biddeford, ME21,3414020%
      Falmouth Foreside, ME1,6374020%
      Littlejohn Island, ME954020%
      Scarborough, ME5,2684020%
      Westbrook, ME17,9694020%
      Portland, ME66,6494020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Palo Alto, CA66,6494314%
      Camarillo, CA66,630468%
      Woodbury, MN66,699468%
      South San Francisco, CA66,5874020%
      Oshkosh, WI66,7133628%
      Portland, ME66,6494020%
      Source: The Downtown, 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.