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Weather in September in Portland, Maine

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< September >
 
Normal Max/ High Temperature 21°C (69°F)
 
Average Temperature 15°C (59°F)
 
Min/ Low Temperature 9°C (49°F)
 
Normal Precipitation 79mm (3.1in)
Number of Wet Days (probability of rain on a day) 10 (33%)
Average Sunlight per day 07:34
Average Daylight per day 12:27
Sunny (Cloudy) Daylight Hours 62% (38%)
Sun altitude at solar noon on the 21st day.
46.9°


  • The average temperature in Portland, Maine in September is mild at 15.1 °C (59.18 °F).
  • Afternoons can be warm with average high temperatures reaching 20.7 °C (69.3 °F).
  • Overnight temperatures are generally a little cool with an average low of 9.4 °C (48.9 °F).
  • The variation/ range of daily average temperatures in September is 11.3 °C (20.3 °F).
  • The weather in September is somewhat dry with rain at times. Just 78.5mm (3.1in) of water falls across an average of 10 days.
  • The blue above Portland, Maine is slightly sunny with on average a welcome 7:34 of intense sunshine daily.
  • The shortest day is 11:42 long and the longest day is 13:11 long with an average length of 12:27.
  • There are approximately 4:41 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 61.7% of daylight hours and cloudy 38.3% of daylight hours.

Check the distance to and compare the Portland, Maine September averages with somewhere beginning with:

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Weather Trend Graph for September in Portland, Maine, Usa

Graph of weather in Portland, Maine in September

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