Weatheo

Portland Weather by Month

Average temperatures, rainfall and humidity for Portland, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Portland month looks like before you travel — then check the live Portland forecast for the days ahead.

Warmest month

July

28°C average high

Coolest month

January

-7°C average low

Wettest month

June

84 mm of rain

Driest month

February

29 mm of rain

Average temperature and rainfall in Portland by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January1°C-7°C-22°C / 19°C
42 mm
69%11 km/h
February3°C-6°C-25°C / 24°C
29 mm
68%11 km/h
March7°C-2°C-19°C / 24°C
49 mm
63%12 km/h
April14°C3°C-9°C / 31°C
72 mm
62%12 km/h
May21°C9°C-1°C / 34°C
80 mm
66%10 km/h
June25°C14°C3°C / 37°C
84 mm
71%8 km/h
July28°C18°C11°C / 36°C
78 mm
73%8 km/h
August27°C16°C8°C / 36°C
64 mm
74%8 km/h
September23°C13°C1°C / 33°C
74 mm
76%8 km/h
October16°C7°C-6°C / 29°C
84 mm
76%9 km/h
November9°C1°C-14°C / 25°C
56 mm
71%10 km/h
December4°C-3°C-21°C / 17°C
71 mm
74%10 km/h

Best time to visit Portland

The most comfortable time to visit Portland is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 784 mm a year.

Travellers who prefer heat should aim for July, when highs average 28°C. June is the month to avoid if rain would spoil your plans — it averages 84 mm, roughly 3× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Portland forecast for what is happening now.

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