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Key findings

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

Compare South Portland, ME Weather

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      South Portland 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"

      South 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.
      IndexSouth PortlandMaineNational
      Air quality index403350
      Pollution index2,043,7002,555,8535,066,862

      South Portland 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

      South Portland air quality information

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

      Average monthly South Portland temperature with heat index

      South Portland monthly precipitation with daily maximum

      South Portland monthly snow depth with daily maximum

      South Portland monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Falmouth, ME2,0184020%
      Little Falls, ME6354020%
      Portland, ME66,6494020%
      Westbrook, ME17,9694020%
      Biddeford, ME21,3414020%
      South Portland, ME25,3974020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Cabot, AR25,4074510%
      West Memphis, AR25,4114510%
      Clinton, MS25,4114412%
      Lafayette, CA25,3814020%
      Melrose Park, IL25,4225510%
      South Portland, ME25,3974020%
      Source: The South 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.