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 (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
0°C maximum daytime temperature in January in Portland0
1°C maximum daytime temperature in February in Portland1
6°C maximum daytime temperature in March in Portland6
12°C maximum daytime temperature in April in Portland12
18°C maximum daytime temperature in May in Portland18
23°C maximum daytime temperature in June in Portland23
26°C maximum daytime temperature in July in Portland26
25°C maximum daytime temperature in August in Portland25
21°C maximum daytime temperature in September in Portland21
15°C maximum daytime temperature in October in Portland15
9°C maximum daytime temperature in November in Portland9
2°C maximum daytime temperature in December in Portland2
Min temperature (night-time)
-11°C minimum night-time temperature in January in Portland-11
-10°C minimum night-time temperature in February in Portland-10
-4°C minimum night-time temperature in March in Portland-4
1°C minimum night-time temperature in April in Portland1
6°C minimum night-time temperature in May in Portland6
11°C minimum night-time temperature in June in Portland11
15°C minimum night-time temperature in July in Portland15
14°C minimum night-time temperature in August in Portland14
10°C minimum night-time temperature in September in Portland10
4°C minimum night-time temperature in October in Portland4
-1°C minimum night-time temperature in November in Portland-1
-8°C minimum night-time temperature in December in Portland-8
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
5°C sea temperature in January in Portland5
3°C sea temperature in February in Portland3
3°C sea temperature in March in Portland3
5°C sea temperature in April in Portland5
8°C sea temperature in May in Portland8
12°C sea temperature in June in Portland12
16°C sea temperature in July in Portland16
17°C sea temperature in August in Portland17
15°C sea temperature in September in Portland15
12°C sea temperature in October in Portland12
9°C sea temperature in November in Portland9
7°C sea temperature in December in Portland7

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 (mm)
94 mm monthly rainfall in January in Portland94
88 mm monthly rainfall in February in Portland88
99 mm monthly rainfall in March in Portland99
105 mm monthly rainfall in April in Portland105
92 mm monthly rainfall in May in Portland92
85 mm monthly rainfall in June in Portland85
77 mm monthly rainfall in July in Portland77
75 mm monthly rainfall in August in Portland75
81 mm monthly rainfall in September in Portland81
100 mm monthly rainfall in October in Portland100
131 mm monthly rainfall in November in Portland131
117 mm monthly rainfall in December in Portland117

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 / mm)  |  Imperial (°F / inches)

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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 UK

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

Maximum daytime temperature (°C)

Portland, Maine, USA
UK (London)
0
7
1
7
6
10
12
13
18
17
23
20
26
22
25
22
21
19
15
15
9
10
2
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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