Portland weather by month

Check out Portland weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Portland (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
32°F maximum daytime temperature in January in Portland32
34°F maximum daytime temperature in February in Portland34
43°F maximum daytime temperature in March in Portland43
54°F maximum daytime temperature in April in Portland54
64°F maximum daytime temperature in May in Portland64
73°F maximum daytime temperature in June in Portland73
79°F maximum daytime temperature in July in Portland79
77°F maximum daytime temperature in August in Portland77
70°F maximum daytime temperature in September in Portland70
59°F maximum daytime temperature in October in Portland59
48°F maximum daytime temperature in November in Portland48
36°F maximum daytime temperature in December in Portland36
Min temperature (night-time)
12°F minimum night-time temperature in January in Portland12
14°F minimum night-time temperature in February in Portland14
25°F minimum night-time temperature in March in Portland25
34°F minimum night-time temperature in April in Portland34
43°F minimum night-time temperature in May in Portland43
52°F minimum night-time temperature in June in Portland52
59°F minimum night-time temperature in July in Portland59
57°F minimum night-time temperature in August in Portland57
50°F minimum night-time temperature in September in Portland50
39°F minimum night-time temperature in October in Portland39
30°F minimum night-time temperature in November in Portland30
18°F minimum night-time temperature in December in Portland18
Heat & Humidity
No heat & humidity in January in Portland0
No heat & humidity in February in Portland0
No heat & humidity in March in Portland0
No heat & humidity in April in Portland0
No heat & humidity in May in Portland0
No heat & humidity in June in Portland0
Low heat & humidity in July in PortlandL
Low heat & humidity in August in PortlandL
No heat & humidity in September in Portland0
No heat & humidity in October in Portland0
No heat & humidity in November in Portland0
No heat & humidity in December in Portland0
Sea temperature
41°F sea temperature in January in Portland41
37°F sea temperature in February in Portland37
37°F sea temperature in March in Portland37
41°F sea temperature in April in Portland41
46°F sea temperature in May in Portland46
54°F sea temperature in June in Portland54
61°F sea temperature in July in Portland61
63°F sea temperature in August in Portland63
59°F sea temperature in September in Portland59
54°F sea temperature in October in Portland54
48°F sea temperature in November in Portland48
45°F sea temperature in December in Portland45

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Portland

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in Portland9
11 hours of daylight per day in February in Portland11
12 hours of daylight per day in March in Portland12
13 hours of daylight per day in April in Portland13
15 hours of daylight per day in May in Portland15
15 hours of daylight per day in June in Portland15
15 hours of daylight per day in July in Portland15
14 hours of daylight per day in August in Portland14
12 hours of daylight per day in September in Portland12
11 hours of daylight per day in October in Portland11
10 hours of daylight per day in November in Portland10
9 hours of daylight per day in December in Portland9
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Portland1
UV (maximum) index 2 (Low) in February in Portland2
UV (maximum) index 3 (Moderate) in March in Portland3
UV (maximum) index 5 (Moderate) in April in Portland5
UV (maximum) index 7 (High) in May in Portland7
UV (maximum) index 8 (Very High) in June in Portland8
UV (maximum) index 8 (Very High) in July in Portland8
UV (maximum) index 7 (High) in August in Portland7
UV (maximum) index 5 (Moderate) in September in Portland5
UV (maximum) index 3 (Moderate) in October in Portland3
UV (maximum) index 2 (Low) in November in Portland2
UV (maximum) index 1 (Low) in December in Portland1

Rainfall in Portland

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
11 days with some rainfall in January in Portland11
10 days with some rainfall in February in Portland10
11 days with some rainfall in March in Portland11
12 days with some rainfall in April in Portland12
12 days with some rainfall in May in Portland12
11 days with some rainfall in June in Portland11
10 days with some rainfall in July in Portland10
10 days with some rainfall in August in Portland10
9 days with some rainfall in September in Portland9
10 days with some rainfall in October in Portland10
12 days with some rainfall in November in Portland12
12 days with some rainfall in December in Portland12
Average monthly rainfall (inches)
3.7 inches monthly rainfall in January in Portland3.7
3.5 inches monthly rainfall in February in Portland3.5
3.9 inches monthly rainfall in March in Portland3.9
4.1 inches monthly rainfall in April in Portland4.1
3.6 inches monthly rainfall in May in Portland3.6
3.3 inches monthly rainfall in June in Portland3.3
3.0 inches monthly rainfall in July in Portland3.0
3.0 inches monthly rainfall in August in Portland3.0
3.2 inches monthly rainfall in September in Portland3.2
3.9 inches monthly rainfall in October in Portland3.9
5.2 inches monthly rainfall in November in Portland5.2
4.6 inches monthly rainfall in December in Portland4.6

More about Portland

Portland by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Maine (Portland) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Portland?

Portland has a cold climate with warm summers and some rainfall in all months.

Metric (°C)  |  Imperial (°F)

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Tropical storm risk: Portland, Maine hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
0
1%
1.7%
0
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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More about the USA

Compare Portland with the USA

Below the Portland chart shows average maximum daytime temperature for Portland, Maine, USA and the USA (Washington).

Maximum daytime temperature (°F)

Portland, Maine, USA
USA (Washington)
32
41
34
45
43
55
54
66
64
75
73
84
79
88
77
86
70
79
59
68
48
57
36
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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