Portland, OR Weather by Month and Climate Averages
Monthly normals · Rain · Snow Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Portland, OR?
Portland, OR gets 44.1 in of precipitation a year over about 152 rainy days, and about 3.6 in of snow a season. August is the warmest month (average high 81°F) and December the coldest (average low 37°F).
Station: PORTLAND KGW-TV, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Mediterranean climate
Portland, OR has warm summers and chilly winters. Daytime highs range from about 46°F in December to 81°F in August. December is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.
Season
Months
Avg low
Avg high
Winter
Dec–Feb
38°
48°
Spring
Mar–May
45°
62°
Summer
Jun–Aug
57°
78°
Autumn
Sep–Nov
48°
63°
How much rain does Portland get?
Portland gets 44.1 in of precipitation in an average year, spread over about 152 days with measurable rain. That is more rainy days than 94% of the US.
December is the wettest month, with 7.3 in. July is the driest, with 0.4 in. December has the most rainy days, about 19.
The longest dry spell in the last five years lasted 66 days, to September 11, 2022.
From September 2025 to August 2026 Portland got 38.7 in of rain, against a normal of 44.1 in for those months. December 2025 had the most, with 8.5 in.
Monthly rainfall, September 2025 to August 2026, in inches. The dash on each month marks its 1991–2020 normal.
In January, Portland averages a high of 47°F and a low of 38°F. It gets 6.4 in of precipitation over about 18 rainy days. Estimated sunshine is 16% of daylight hours, derived from ERA5 cloud cover. The January record high is 65°F (2005) and the record low is 12°F (1979).
Portland weather in February
In February, Portland averages a high of 51°F and a low of 39°F. It gets 4.7 in of precipitation over about 15 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The February record high is 71°F (1988) and the record low is 8°F (1989).
Portland weather in March
In March, Portland averages a high of 56°F and a low of 41°F. It gets 4.8 in of precipitation over about 18 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The March record high is 82°F (2025) and the record low is 24°F (1989).
Portland weather in April
In April, Portland averages a high of 61°F and a low of 44°F. It gets 3.6 in of precipitation over about 16 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The April record high is 90°F (2016) and the record low is 31°F (2008).
Portland weather in May
In May, Portland averages a high of 68°F and a low of 49°F. It gets 2.6 in of precipitation over about 12 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The May record high is 103°F (1983) and the record low is 36°F (1978). May is one of the most comfortable months to visit.
Portland weather in June
In June, Portland averages a high of 73°F and a low of 53°F. It gets 1.5 in of precipitation over about 9 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The June record high is 114°F (2021) and the record low is 40°F (2018). June is one of the most comfortable months to visit.
Portland weather in July
In July, Portland averages a high of 80°F and a low of 58°F. It gets 0.4 in of precipitation over about 3 rainy days. Estimated sunshine is 73% of daylight hours, derived from ERA5 cloud cover. The July record high is 105°F (2009) and the record low is 45°F (1988).
Portland weather in August
In August, Portland averages a high of 81°F and a low of 58°F. It gets 0.5 in of precipitation over about 3 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The August record high is 106°F (1981) and the record low is 46°F (1973).
Portland weather in September
In September, Portland averages a high of 75°F and a low of 55°F. It gets 1.6 in of precipitation over about 7 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The September record high is 103°F (1988) and the record low is 41°F (1982). September is one of the most comfortable months to visit.
Portland weather in October
In October, Portland averages a high of 63°F and a low of 48°F. It gets 4.0 in of precipitation over about 13 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The October record high is 92°F (1987) and the record low is 31°F (1991). October is one of the most comfortable months to visit.
Portland weather in November
In November, Portland averages a high of 52°F and a low of 42°F. It gets 6.6 in of precipitation over about 18 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The November record high is 71°F (1975) and the record low is 19°F (2010).
Portland weather in December
In December, Portland averages a high of 46°F and a low of 37°F. It gets 7.3 in of precipitation over about 19 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The December record high is 67°F (1993) and the record low is 10°F (1983).
Sunshine, humidity and wind in Portland
July is the sunniest month in Portland, with estimated sunshine of 73% of daylight hours from ERA5 cloud cover. January is the cloudiest, at 16%. The annual cloud-cover estimate is 40% of daylight hours; it is not a measurement of sunshine duration. Portland is cloudier than 88% of the US.
Humidity peaks in December at 85% and is lowest in July at 53%.
Portland has about 12 days a year above 90°F. Portland is cooler than 74% of the US.
The first fall freeze in Portland typically comes around November 28, and the last spring freeze around March 2. That leaves a frost-free growing season of about 271 days.
Portland weather records
These records cover PORTLAND KGW-TV during 1973–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Portland station is 114°F, on June 28, 2021. The coldest is 8°F, on February 3, 1989.
The wettest day in the available station history brought 3.2 in of precipitation, on October 27, 1994.
35 all-time records have been set at the station since 1973.
The annual mean temperature has changed by +0.2°F per decade since 1974.
The best time to visit Portland
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.
Winter (December–February) is chilly, with average highs around 48°F and lows near 38°F. Snow is possible.
Spring (March–May) is mild, with average highs around 62°F and lows near 45°F.
Summer (June–August) is warm, with average highs around 78°F and lows near 57°F.
Autumn (September–November) is mild, with average highs around 63°F and lows near 48°F.
Portland climate questions
How much rain does Portland get?
Portland gets 44.1 in of precipitation in an average year, over about 152 rainy days.
What is the wettest month in Portland?
December is the wettest month in Portland, with 7.3 in. July is the driest, with 0.4 in.
How many rainy days does Portland have a year?
Portland has about 152 days with measurable rain in an average year. December has the most, about 19.
Does it snow in Portland?
Yes. Portland gets about 3.6 in of snow in an average season. The snowiest winter on record is 2008–09, with 23.9 in.
What is the hottest month in Portland?
August is the warmest month in Portland, with an average high of 81°F.
What is the coldest month in Portland?
December is the coldest month in Portland, with an average low of 37°F.
What is the record high temperature in Portland?
Within the available 1973–2026 station history, the record high at the Portland station is 114°F, set on June 28, 2021. The record low is 8°F, on February 3, 1989.
What is the sunniest month in Portland?
July is the sunniest month in Portland, with estimated sunshine of 73% of daylight hours from ERA5 cloud cover. January is the cloudiest.
When is the first frost in Portland?
The first fall freeze in Portland typically comes around November 28. The last spring freeze is around March 2.
What is the best time to visit Portland?
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.
