Climate and monthly weather forecast
Portland, OR

A colorful autumn view of the outline of Portland City, Oregon, USA
A colorful autumn view of the outline of Portland City, Oregon, USA

Weather in January

January, the same as December, in Portland, Oregon, is a frosty winter month, with an average temperature varying between 35.2°F (1.8°C) and 46.2°F (7.9°C). In January, the average high-temperature is relatively the same as in December - a still frosty 46.2°F (7.9°C). Weather in January »

Weather in February

The last month of the winter, February, is also a frosty month in Portland, Oregon, with an average temperature fluctuating between 47.5°F (8.6°C) and 35.8°F (2.1°C). In Portland, the average high-temperature in February is almost the same as in January - a still frosty 47.5°F (8.6°C). Weather in February »

Weather in March

March, the first month of the spring in Portland, is a cool month, with an average temperature ranging between max 52.5°F (11.4°C) and min 38.1°F (3.4°C). In March, the average high-temperature is relatively the same as in February - a fresh 52.5°F (11.4°C). Weather in March »

Weather in April

April in Portland, Oregon, is a moderate spring month, with an average temperature ranging between max 58.6°F (14.8°C) and min 39.7°F (4.3°C). In April, the average high-temperature marginally rises from a fresh 52.5°F (11.4°C) in March to a mild 58.6°F (14.8°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Portland, Oregon, with temperature in the range of an average low of 44.2°F (6.8°C) and an average high of 67.1°F (19.5°C). In Portland, the average high-temperature in May marginally rises from a mild 58.6°F (14.8°C) in April to an enjoyable 67.1°F (19.5°C). Weather in May »

Weather in June

June, the first month of the summer in Portland, is a pleasant month, with an average temperature ranging between min 48.4°F (9.1°C) and max 72.1°F (22.3°C). In Portland, the average high-temperature in June is practically the same as in May - an agreeable 72.1°F (22.3°C). Weather in June »

Weather in July

July is a warm summer month in Portland, Oregon, with an average temperature ranging between max 80.6°F (27°C) and min 52.5°F (11.4°C). In July, the average high-temperature slightly increases from a pleasant 72.1°F (22.3°C) in June to a moderately hot 80.6°F (27°C). Weather in July »

Weather in August

August, the last month of the summer in Portland, is also a moderately hot month, with temperature in the range of an average high of 81.5°F (27.5°C) and an average low of 55°F (12.8°C). August is the warmest month, with an average high-temperature of 81.5°F (27.5°C) and an average low-temperature of 55°F (12.8°C). In August, the average heat index is estimated at 84.2°F (29°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Portland, Oregon, with an average temperature fluctuating between 51.3°F (10.7°C) and 74.1°F (23.4°C). In September, the average high-temperature marginally drops from 81.5°F (27.5°C) in August to a still moderately hot 74.1°F (23.4°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Portland, Oregon, with an average temperature varying between 45.5°F (7.5°C) and 61.7°F (16.5°C). In October, the average high-temperature drops from a warm 74.1°F (23.4°C) in September to an enjoyable 61.7°F (16.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Portland, is another cool month, with temperature in the range of an average low of 40.3°F (4.6°C) and an average high of 51.1°F (10.6°C). In November, the average high-temperature drops from an enjoyable 61.7°F (16.5°C) in October to a fresh 51.1°F (10.6°C). Weather in November »

Weather in December

December, the first month of the winter in Portland, is also a frosty month, with an average temperature fluctuating between 44.1°F (6.7°C) and 34.7°F (1.5°C). With an average high-temperature of 44.1°F (6.7°C) and an average low-temperature of 34.7°F (1.5°C), December is the coldest month. Weather in December »
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FAQ

What are the most humid months in Portland?

The months with the highest humidity in Portland, Oregon, are January, February and December, with an average relative humidity of 83%.

How much does it rain in Portland?

In Portland, Oregon, during the entire year, the rain falls for 173.1 days and collects up to 31.18" (792mm) of precipitation.

When does it snow in Portland?

Months with snowfall are January through March, November and December.

How many days does it snow in Portland?

Throughout the year, there are 6.4 snowfall days, and 3.94" (100mm) of snow is accumulated.

What is the month with the least sunshine in Portland?

The month with the least sunshine is January, with an average of 4.1h of sunshine.

What is the month with the lowest UV index in Portland?

The months with the lowest UV index in Portland are January, February, November and December, with an average maximum UV index of 2.

What is the snowiest month in Portland?

March is the month with the most snowfall. Snow falls for 1.6 days and accumulates 1.5" (38mm) of snow.

When is Daylight Saving Time (DST) in Portland?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Portland, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow in Portland?

In Portland, Oregon, snow does not fall in April through October.

When are the longest days in Portland?

With an average of 15h and 38min of daylight, June has the longest days of the year in Portland.

What is the driest month in Portland?

The month with the least rainfall in Portland is July, when the rain falls for 4.9 days and typically collects 0.31" (8mm) of precipitation.

When is the highest UV index in Portland?

July is the month with the highest UV index in Portland, Oregon, with an average maximum UV index of 6.

What is the warmest month in Portland?

The warmest month in Portland, Oregon, is August, with an average high-temperature of 81.5°F (27.5°C) and an average low-temperature of 55°F (12.8°C).

What is the least humid month in Portland?

With an average relative humidity of 63%, August is the least humid month in Portland, Oregon.

What month has the most sunshine in Portland?

The month with the most sunshine is August, with an average of 10.9h of sunshine.

What is the coldest month in Portland?

December is the coldest month, with an average high-temperature of 44.1°F (6.7°C) and an average low-temperature of 34.7°F (1.5°C).

What is the rainiest month in Portland?

December is the month with the most rainfall. Rain falls for 18.5 days and accumulates 4.53" (115mm) of precipitation.

What is the month with the shortest days in Portland?

With an average of 8h and 46min of daylight, December has the shortest days of the year in Portland.

Average temperature
Portland, OR

Average temperature - Portland, OR

The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (44.1°F).

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

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Average pressure
Portland, OR

Average pressure - Portland, OR

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed
Portland, OR

Average wind speed - Portland, OR

The windiest month (with the highest average wind speed) is January (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity
Portland, OR

Average humidity - Portland, OR

The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is August (63%).

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Average rainfall
Portland, OR

Average rainfall - Portland, OR

The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days
Portland, OR

Average rainfall days - Portland, OR

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.9 days).

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Average snowfall
Portland, OR

Average snowfall - Portland, OR

The month with the highest snowfall is March (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Portland, OR

Average snowfall days - Portland, OR

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Portland, OR

Average daylight / Average sunshine - Portland, OR

The month with the longest days is June (Average daylight: 15h and 38min).
The month with the shortest days is December (Average daylight: 8h and 46min).

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days
Portland, OR

Average sunshine days - Portland, OR

The months with the most sunshine days are July and August (23.8 days).
The month with the least sunshine days is March (8.3 days).

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Average UV index
Portland, OR

Average UV index - Portland, OR

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Portland, OR

Average visibility - Portland, OR

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

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