When to go · United States

When to go to Portland

Twelve months of averages for Portland, and what they say about when to go.

When to go

What the averages say

Mean daily highs and lows and the month's rain, averaged over 2001 to 2020.

On these averages, Portland has a mean high between 18°C and 32°C and under 150 mm of rain in July to September.

Cold months (a mean high under 10°C): November to April.
The warmest month is August (21°C) and the coolest January (1°C). The wettest is October (145 mm) and the driest August (94 mm); about 1,363 mm of rain falls in a year.

How these sentences are worded

Each sentence is written from the figures by fixed rules, and says no more than they do. Mild to warm: a mean daily high from 18°C up to 32°C. Hot: 32°C or more. Cool: 10°C up to 18°C. Cold: under 10°C. Dry: under 50 mm of rain in the month; wet: 150 mm or more. Humid: a high of 25°C or more with relative humidity of 70% or more. A month is described as good for going when it is mild to warm and not wet.

Portland: highs, lows and rainHighLowRain

The year at a glance

Mild to warm and dry
Mild to warm, humid or showery
Hot
Cool
Wet
Cold

JanCold
FebCold
MarCold
AprCold
MayCool
JunCool
JulMild–warm, mixed
AugMild–warm, mixed
SeptMild–warm, mixed
OctCool
NovCold
DecCold

Month by month

Every month in Portland

The whole year, with humidity, cloud and the sunlight reaching the ground.

Climate in Portland by month: mean daily high and low, rain, and what the month is like
Month	High	Low	Rain	Humidity	Cloud	Sunlight (kWh/m²/day)	High in Dubai	What it is like
January	1°C	-4°C	103 mm	85%	65%	1.7	23°C	Cold
February	1°C	-4°C	103 mm	83%	63%	2.5	24°C	Cold
March	4°C	-1°C	110 mm	81%	62%	3.7	27°C	Cold
April	8°C	4°C	121 mm	83%	62%	4.7	31°C	Cold
May	12°C	8°C	101 mm	87%	66%	5.3	35°C	Cool
June	17°C	13°C	127 mm	88%	62%	5.6	37°C	Cool
July	21°C	17°C	96 mm	88%	55%	5.9	39°C	Mild to warm, humid or showery
August	21°C	18°C	94 mm	86%	52%	5.3	39°C	Mild to warm, humid or showery
September	18°C	15°C	97 mm	83%	50%	4.3	37°C	Mild to warm, humid or showery
October	13°C	10°C	145 mm	81%	59%	2.8	34°C	Cool
November	9°C	5°C	125 mm	81%	61%	1.8	29°C	Cold
December	4°C	0°C	141 mm	83%	66%	1.4	25°C	Cold

The Dubai column is Dubai's mean daily high, for comparison.

Modelled averages for an area about 50 km across, not a weather station's record: NASA POWER climatology, 2001–2020. These data were obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program.

When to go nearby

Plan it

Plan a trip to Portland

Tell us when and who is travelling, and a person puts the flights, the stays and the rest into one quote.

Plan a trip to Portland More about Portland When to go

Month

High

Low

Rain

Humidity

Cloud

Sunlight (kWh/m²/day)

High in Dubai

What it is like

January

1°C

-4°C

103 mm

85%

65%

1.7

23°C

Cold

February

1°C

-4°C

103 mm

83%

63%

2.5

24°C

Cold

March

4°C

-1°C

110 mm

81%

62%

3.7

27°C

Cold

April

8°C

4°C

121 mm

83%

62%

4.7

31°C

Cold

May

12°C

8°C

101 mm

87%

66%

5.3

35°C

Cool

June

17°C

13°C

127 mm

88%

62%

5.6

37°C

Cool

July

21°C

17°C

96 mm

88%

55%

5.9

39°C

Mild to warm, humid or showery

August

21°C

18°C

94 mm

86%

52%

5.3

39°C

Mild to warm, humid or showery

September

18°C

15°C

97 mm

83%

50%

4.3

37°C

Mild to warm, humid or showery

October

13°C

10°C

145 mm

81%

59%

2.8

34°C

Cool

November

9°C

5°C

125 mm

81%

61%

1.8

29°C

Cold

December

4°C

0°C

141 mm

83%

66%

1.4

25°C

Cold