Heat Advisory
* WHAT...Afternoon high temperatures of 90 to 95 degrees and morning
low temperatures of 55 to 63 degrees expected.
* WHERE...Portions of northwest and west central Oregon and southwest
Washington.
* WHEN...Until 11 PM PDT Thursday.
* IMPACTS...Hot temperatures may cause heat…
Heat Advisory
* WHAT...Afternoon high temperatures of 90 to 95 degrees and morning
low temperatures of 55 to 63 degrees expected.
* WHERE...Portions of northwest and west central Oregon and southwest
Washington.
* WHEN...Until 11 PM PDT Thursday.
* IMPACTS...Hot temperatures and high humid…
Fire Weather Watch
...BREEZY WESTERLY WINDS AND LOW RELATIVE HUMIDITY FRIDAY AND
SATURDAY THROUGH THE CASCADE GAPS AND INTO THE COLUMBIA BASIN...
.Breezy westerly winds through the Cascade gaps will likely (60-
80% chance) overlap with low relative humidity and generate Red
Flag conditions Friday …
Tomorrow in Portland looks
sunny, with a high of 93°
and an overnight low of 62°.
Rain is unlikely (1% chance).
Winds top out near 11 mph,
and the UV index reaches 8 (very high).
Portland has a Mediterranean climate, marked by hot, dry summers and mild, wetter winters. Average daytime highs range from about 46°F (8°C) in December to around 84°F (29°C) in August, and the city records roughly 148 days of measurable precipitation a year.
Portland weather: quick facts
Hottest month: August - highs near 84°F (29°C)
Coldest month: December - highs near 46°F (8°C)
Record high: 115°F (46°C) · Record low: 6°F (-14°C) (2015–2024)
Wettest month: December (19 rainy days) · Sunniest: July (13.2 h sun/day)
Climate type:Mediterranean - hot, dry summers and mild, wetter winters
Snow: about 9 days a year
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 84°F (29°C) and overnight lows stay near 59°F (15°C). The coolest month is December, with typical highs of 46°F (8°C) and lows around 36°F (2°C). Based on 2015–2024 weather data, temperatures have reached as high as 115°F (46°C) and dropped as low as 6°F (-14°C).
Rain, sun and snow
December is usually the wettest month. It brings about 8.9 inches (225 mm) of rain over 19 days, while July is the driest. July brings the most sunshine, averaging 13.2 hours of sun a day. Snow falls on about 9 days in a typical year, mostly from December through April.
Season by season
Spring (March through May)
Spring in Portland is mild, with daytime highs averaging 60°F (16°C) and nights around 43°F (6°C); expect showers on roughly 43 days across the season, plus around 3 snowy days.
Summer (June through August)
Summer in Portland is hot, with daytime highs averaging 81°F (27°C) and nights around 57°F (14°C); rain falls on about 13 days over the three months.
Fall (September through November)
Fall in Portland is crisp but comfortable, with daytime highs averaging 63°F (17°C) and nights around 47°F (8°C); expect showers on roughly 37 days across the season.
Winter (December through February)
Winter in Portland is chilly, with daytime highs averaging 47°F (8°C) and nights around 36°F (2°C); expect showers on roughly 55 days across the season, plus around 6 snowy days.
Average temperatures in Portland by month
Monthly averages for Portland based on 2015–2024 weather data.
August is the hottest month in Portland, with average highs of 84°F (29°C) and overnight lows near 59°F (15°C). In the past decade the temperature has peaked at 115°F (46°C).
What is the coldest month in Portland?
December is the coldest month, with highs averaging 46°F (8°C) and lows around 36°F (2°C). The lowest reading in recent years was 6°F (-14°C).
What is the rainiest month in Portland?
December is typically the wettest month, averaging 8.9 inches (225 mm) of precipitation across about 19 days. July is usually the driest.
Does it snow in Portland?
Yes. Portland averages about 9 days of snowfall a year, concentrated December through April.
What is the best time to visit Portland?
The best time to visit Portland is generally May to July and September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 75°F (24°C).
How sunny is Portland?
Portland averages 8.2 hours of sunshine per day across the year. July is the sunniest month at about 13.2 hours of sun a day.
Is Portland humid?
Relative humidity in Portland averages about 75% over the year, which feels fairly humid. Combined with August heat, muggy conditions are common in summer - the dew point is the number to watch.