Portland weather by month

Portland runs from an average daily high of 47°F in December to 82°F in August, with overnight lows between 36°F (January) and 59°F (August).

December is the wettest month (5.8 inches) and July the driest (0.5 inches); about 37 inches fall in a normal year.

Snow is a real part of the year here: about 4 inches in a normal winter, most in January.

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for Portland day trips are May-Sep.

Month by month in Portland

Month	Average high	Average low	Rain (in)	Snow (in)	Day trips open
January	48°F	36°F	5.0	1.7	120 of 130
February	52°F	37°F	3.7	1.2	120 of 130
March	57°F	40°F	4.0	0.1	122 of 130
April	62°F	44°F	2.9	0.0	122 of 130
May best	69°F	49°F	2.5	0.0	124 of 130
June best	74°F	54°F	1.6	0.0	126 of 130
July best	82°F	58°F	0.5	0.0	129 of 130
August best	82°F	59°F	0.5	0.0	129 of 130
September best	77°F	54°F	1.5	0.0	129 of 130
October	64°F	47°F	3.4	0.0	128 of 130
November	54°F	41°F	5.5	0.0	122 of 130
December	47°F	36°F	5.8	1.2	121 of 130

The numbers are from NOAA's station at Portland Intl Airport, Or (USW00024229). Climate normals 1991-2020: long-run averages, not a forecast. "Day trips open" counts the places within 3 hours that are open or in season on the 15th, from our own place data.

Questions about Portland weather

What is the best time to visit Portland?

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for Portland day trips are May-Sep.

What is the hottest and coldest month in Portland?

August is the hottest (average high 82°F) and January the coolest (average low 36°F).

When does it rain the most in Portland?

December is the wettest month (5.8 inches) and July the driest (0.5 inches).

Does it snow in Portland?

Yes: about 4 inches in a normal year, most in January.

Where do these weather numbers come from?

The numbers are from NOAA's station at Portland Intl Airport, Or (USW00024229). They are 1991-2020 climate normals (long-run averages), not a forecast. For today's weather use the National Weather Service forecast.