TODAY MAR29
TEMPERATURE40
HUMIDITY93
PRESSURE100140
WIND COND.340 13
  • 4628Sat
  • 4527Sun
  • 4929Mon
  • 4432Tue60%
  • 3931Wed70%70%
daynightWeather update from Rockland, Knox County Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Belfast for July is 66.4 degrees
  • The lowest monthly average temperature in Belfast for January is 25.3 degrees
  • The most monthly precipitation in Belfast occurs in July with 8.7 inches
  • The air quality index in Belfast is 14% better than the national average
  • The pollution index in Belfast is 32% better than the national average

Compare Belfast, ME Weather

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      Belfast 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
      January16°F34°F25°F6.6"
      February16°F34°F25°F4.8"
      March24°F41°F33°F6.1"
      April35°F52°F43°F5.2"
      May44°F61°F52°F6.0"
      June52°F68°F60°F7.2"
      July58°F75°F66°F8.7"
      August57°F75°F65°F6.7"
      September51°F69°F60°F7.8"
      October41°F58°F50°F7.9"
      November32°F49°F40°F8.2"
      December22°F39°F30°F6.2"

      Belfast 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.
      IndexBelfastMaineNational
      Air quality index363342
      Pollution index1,854,0403,417,5212,726,193

      Belfast air quality information

      MeasurementTotal
      Days measured213
      Days with good air quality204
      Days with moderate air quality9
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Belfast air quality information

      PollutantTotal
      Arsenic0.004%
      Benzene0.020%
      Carbon Tetrachloride0.005%
      Lead0.010%
      Mercury0.002%

      Average monthly Belfast temperature with heat index

      Belfast monthly precipitation with daily maximum

      Belfast monthly snow depth with daily maximum

      Belfast monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Bucksport, ME2,8793138.0%
      Searsport, ME1,0393138.0%
      Castine, ME8133628.0%
      Camden, ME3,5433628.0%
      Belfast, ME6,7103628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Lake Hallie, WI6,7103432.0%
      Avon, CO6,711476.0%
      Moapa Valley, NV6,708548.0%
      Lionville, PA6,7074216.0%
      Scottsburg, IN6,7153530.0%
      Belfast, ME6,7103628.0%
      Source: The Belfast, 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.