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Climate & Weather Averages in Portland, Maine, USA

Currently: 68 °F. Passing clouds. (Weather station: Portland - Portland International Jetport, USA). See more current weather

Annual Weather Averages in Portland

Based on weather reports collected during 1992–2021.

All Year Climate & Weather Averages in Portland

High Temp: 79 °F

Low Temp: 15 °F

Mean Temp: 47 °F

Precipitation: 3.93"

Humidity: 70%

Dew Point: 37 °F

Wind: 12 mph

Pressure: 30.02 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Portland

High Temp: 32 °F

Low Temp: 15 °F

Mean Temp: 24 °F

Precipitation: 3.35"

Humidity: 68%

Dew Point: 14 °F

Wind: 13 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

February Climate & Weather Averages in Portland

High Temp: 35 °F

Low Temp: 17 °F

Mean Temp: 26 °F

Precipitation: 3.62"

Humidity: 65%

Dew Point: 15 °F

Wind: 14 mph

Pressure: 30.03 "Hg

Visibility: 9 mi

March Climate & Weather Averages in Portland

High Temp: 42 °F

Low Temp: 25 °F

Mean Temp: 33 °F

Precipitation: 3.74"

Humidity: 64%

Dew Point: 22 °F

Wind: 14 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

April Climate & Weather Averages in Portland

High Temp: 53 °F

Low Temp: 35 °F

Mean Temp: 44 °F

Precipitation: 4.25"

Humidity: 64%

Dew Point: 32 °F

Wind: 14 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

May Climate & Weather Averages in Portland

High Temp: 63 °F

Low Temp: 45 °F

Mean Temp: 54 °F

Precipitation: 3.64"

Humidity: 70%

Dew Point: 44 °F

Wind: 12 mph

Pressure: 30.00 "Hg

Visibility: 9 mi

June Climate & Weather Averages in Portland

High Temp: 73 °F

Low Temp: 54 °F

Mean Temp: 64 °F

Precipitation: 4.15"

Humidity: 73%

Dew Point: 54 °F

Wind: 11 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Portland

High Temp: 79 °F

Low Temp: 60 °F

Mean Temp: 70 °F

Precipitation: 3.69"

Humidity: 74%

Dew Point: 61 °F

Wind: 10 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

August Climate & Weather Averages in Portland

High Temp: 78 °F

Low Temp: 59 °F

Mean Temp: 69 °F

Precipitation: 3.16"

Humidity: 74%

Dew Point: 60 °F

Wind: 9 mph

Pressure: 29.99 "Hg

Visibility: 9 mi

September Climate & Weather Averages in Portland

High Temp: 71 °F

Low Temp: 52 °F

Mean Temp: 61 °F

Precipitation: 3.78"

Humidity: 76%

Dew Point: 53 °F

Wind: 10 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

October Climate & Weather Averages in Portland

High Temp: 59 °F

Low Temp: 40 °F

Mean Temp: 50 °F

Precipitation: 5.27"

Humidity: 74%

Dew Point: 42 °F

Wind: 11 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

November Climate & Weather Averages in Portland

High Temp: 48 °F

Low Temp: 31 °F

Mean Temp: 39 °F

Precipitation: 4.19"

Humidity: 71%

Dew Point: 30 °F

Wind: 12 mph

Pressure: 30.09 "Hg

Visibility: 9 mi

December Climate & Weather Averages in Portland

High Temp: 38 °F

Low Temp: 22 °F

Mean Temp: 30 °F

Precipitation: 4.36"

Humidity: 71%

Dew Point: 21 °F

Wind: 12 mph

Pressure: 30.08 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthJuly (70 °F avg)
Coldest MonthJanuary (24 °F avg)
Wettest MonthOctober (5.27" avg)
Windiest MonthMarch (14 mph avg)
Annual precip.47.20" (per year)

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