TODAY NOV21
TEMPERATURE47
HUMIDITY93
PRESSURE99830
WIND COND.
  • 5141Fri20%90%
  • 4642Sat70%50%
  • 4937Sun
  • 5041Mon
  • 5736Tue50%
daynightWeather update from Boston, Logan International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in South Boston for July is 74.2 degrees
  • The lowest monthly average temperature in South Boston for January is 30.7 degrees
  • The most monthly precipitation in South Boston occurs in October with 5 inches
  • The air quality index in South Boston is 2% worse than the national average
  • The pollution index in South Boston is 781% worse than the national average

Compare Boston, MA Weather

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      South Boston 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
      January23°F40°F31°F3.2"
      February22°F41°F31°F3.2"
      March29°F48°F38°F3.8"
      April40°F61°F49°F3.7"
      May50°F69°F58°F3.8"
      June59°F78°F67°F4.7"
      July66°F85°F74°F4.1"
      August64°F83°F73°F3.5"
      September58°F77°F66°F3.0"
      October48°F66°F56°F5.0"
      November37°F55°F45°F3.3"
      December28°F45°F36°F4.6"

      South Boston 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 BostonBostonMassachusetts
      Air quality index434340
      Pollution index24,018,00024,018,0008,399,610

      South Boston air quality

      MeasurementTotal
      Days measured365
      Days with good air quality291
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.030%
      Benzene0.220%
      Carbon Tetrachloride0.100%
      Lead0.280%
      Mercury0.130%

      Average monthly South Boston temperature with heat index

      South Boston monthly precipitation with daily maximum

      South Boston monthly snow depth with daily maximum

      South Boston monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Dedham, MA25,3304314.0%
      Hull, MA10,4784314.0%
      Newton, MA88,3224314.0%
      Randolph, MA33,5264314.0%
      Weymouth Town, MA57,2134314.0%
      Boston, MA689,3264314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Vancouver, BC694,440n/a 
      El Paso, TX679,879536.0%
      Washington, DC701,974476.0%
      Detroit, MI672,3515612.0%
      Nashville, TN667,0704510.0%
      Boston, MA689,3264314.0%
      Source: The South Boston, Boston, MA 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.