Annual mean 11°C · wettest around February · prevailing wind W
Warmest
27.6 °C
Coldest
1.3 °C
Wettest
43%
Windiest
4.8 m/s
Prevailing
W
3.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Portland over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -2°C. The rainy (wet) season in Portland runs from January to February, peaking in February with a 40% chance of rain on a given day. The dry season is March to December; June is the driest month, at 6%. Winds in Portland are highest in March, averaging 3.6 m/s (13 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Portland come in November, when the sky is typically 39% covered; May is the cloudiest month, at 52%.
Month by month Portland climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
2°C
-2°C
-4°C
37%
50%
3.3 m/s
1
0
6
February
3°C
-1°C
-2°C
40%
47%
3.2 m/s
1
0
11
March
7°C
1°C
2°C
18%
47%
3.6 m/s
3
0
26
April
13°C
6°C
8°C
12%
52%
3.5 m/s
16
1
52
May
19°C
12°C
16°C
10%
52%
2.9 m/s
53
9
73
June
24°C
17°C
23°C
6%
44%
2.6 m/s
71
35
49
July
27°C
21°C
28°C
8%
42%
2.4 m/s
43
62
15
August
26°C
19°C
27°C
7%
41%
2.3 m/s
55
55
23
September
22°C
15°C
22°C
9%
44%
2.4 m/s
73
26
57
October
17°C
10°C
14°C
10%
47%
2.6 m/s
47
5
74
November
10°C
4°C
5°C
9%
39%
3.0 m/s
11
0
39
December
4°C
-0°C
-1°C
13%
48%
2.9 m/s
1
0
13
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Portland weather by season
Year round, Portland has days of about 2°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -2°C to 21°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around February and least likely around June. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Portland weather in winterDecember to February
High 3°CLow -1°CRain 30%
Winter in Portland has typical daily highs of about 3°C and lows of about -1°C, with a 30% chance of rain on a given day.
Portland weather in springMarch to May
High 13°CLow 6°CRain 14%
Spring in Portland has typical daily highs of about 13°C and lows of about 6°C, with a 14% chance of rain on a given day.
Portland weather in summerJune to August
High 26°CLow 19°CRain 7%
Summer in Portland has typical daily highs of about 26°C and lows of about 19°C, with a 7% chance of rain on a given day.
Portland weather in autumnSeptember to November
High 16°CLow 10°CRain 9%
Autumn in Portland has typical daily highs of about 16°C and lows of about 10°C, with a 9% chance of rain on a given day.
When is the rainy season in Portland?
The rainy (wet) season in Portland runs from January to February, peaking in February with a 40% chance of rain on a given day. The dry season is March to December; June is the driest month, at 6%.
What time of year is Portland windiest?
Winds in Portland are highest in March, averaging 3.6 m/s (13 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Portland year round?
The average temperature in Portland over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -2°C.