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Portland (OR) Climate by Month

The graphs below provide an overview of the climate in Portland (Oregon), the United States of America. They present long-term patterns and averages of weather conditions over a 30-year period.

Average day and night temperature

The mean minimum and maximum temperatures over the year.

Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc.

Forecast for Portland (OR)

Mon   Jun 24
26°C | 10°C
N 18 km/h
almost clear and no rain

almost clear and no rain

Tue   Jun 25
30°C | 14°C
NW 11 km/h
clear and no rain

clear and no rain

Wed   Jun 26
24°C | 14°C
W 14 km/h
0.8 mm
overcast and small chance of slight rain

overcast and small chance of slight rain

The best time of year to visit Portland in the United States of America

Portland has a Mediterranean climate, which means a pleasantly warm summer and mild winters. Sometimes temperatures during winter will drop below zero, but this will only be at night.

It can rain quite a bit, especially during winters. The best time to visit Portland in the state of Oregon is from May to September. During this period you have a warm temperature and almost no precipitation.

During the months of May, June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:

  • Which months have the greatest rainfall in Portland?
    Most rainfall (rainy season) is seen in November and December.
  • Does Portland have a dry season?
    Yes, the months of July and August are very dry.
  • Which is the warmest month in Portland?
    August has an average maximum temperature of 28°C and is the warmest month of the year.
  • Which is the coldest month in Portland?
    The coldest month is December with an average maximum temperature of 7°C.
  • Which is the wettest month in Portland?
    December tops the wettest month list with 179 mm of rainfall.
  • Which is the driest month in Portland?
    August is the driest month with 11 mm of precipitation.
  • Which is the sunniest month in Portland?
    July is the sunniest month with an average of 332 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.