Climate and monthly weather forecast
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington

Weather in January

January, like December, is another chilly winter month in Seattle, Washington, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 36°F (2.2°C). In Seattle, the average high-temperature in January is relatively the same as in December - a still chilly 45°F (7.2°C). Weather in January »

Weather in February

February, the last month of the winter in Seattle, is also a frosty month, with temperature in the range of an average low of 35.2°F (1.8°C) and an average high of 46.2°F (7.9°C). In Seattle, the average high-temperature in February is essentially the same as in January - a still frosty 46.2°F (7.9°C). Weather in February »

Weather in March

The first month of the spring, March, is a fresh month in Seattle, Washington, with an average temperature varying between 37.4°F (3°C) and 50.5°F (10.3°C). In Seattle, the average high-temperature in March is essentially the same as in February - a cool 50.5°F (10.3°C). Weather in March »

Weather in April

April in Seattle, Washington, is a mild spring month, with temperature in the range of an average high of 56.5°F (13.6°C) and an average low of 40.5°F (4.7°C). In Seattle, the average high-temperature in April marginally rises from a fresh 50.5°F (10.3°C) in March to a mild 56.5°F (13.6°C). Weather in April »

Weather in May

May, the last month of the spring in Seattle, is an enjoyable month, with an average temperature ranging between min 44.8°F (7.1°C) and max 64.8°F (18.2°C). In Seattle, the average high-temperature in May marginally rises from a moderate 56.5°F (13.6°C) in April to a comfortable 64.8°F (18.2°C). Weather in May »

Weather in June

The first month of the summer, June, is an agreeable month in Seattle, Washington, with temperature in the range of an average low of 48.4°F (9.1°C) and an average high of 69.1°F (20.6°C). In June, the average high-temperature is relatively the same as in May - a pleasant 69.1°F (20.6°C). Weather in June »

Weather in July

July is a moderately hot summer month in Seattle, Washington, with an average temperature ranging between min 52.3°F (11.3°C) and max 75.9°F (24.4°C). In July, the average high-temperature marginally rises from a pleasant 69.1°F (20.6°C) in June to a moderately hot 75.9°F (24.4°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Seattle, Washington, with temperature in the range of an average low of 54°F (12.2°C) and an average high of 76.3°F (24.6°C). August is the warmest month, with an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 54°F (12.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Seattle, Washington, with an average temperature fluctuating between 50.5°F (10.3°C) and 69.6°F (20.9°C). In September, the average high-temperature marginally drops from a warm 76.3°F (24.6°C) in August to a pleasant 69.6°F (20.9°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in Seattle, Washington, with an average temperature fluctuating between 45.3°F (7.4°C) and 58.6°F (14.8°C). In Seattle, the average high-temperature in October decreases from an agreeable 69.6°F (20.9°C) in September to a moderate 58.6°F (14.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Seattle, Washington, with an average temperature fluctuating between 39.4°F (4.1°C) and 49.1°F (9.5°C). In Seattle, the average high-temperature in November decreases from a mild 58.6°F (14.8°C) in October to a chilly 49.1°F (9.5°C). Weather in November »

Weather in December

December, the first month of the winter in Seattle, is also a frosty month, with an average temperature ranging between min 35.1°F (1.7°C) and max 43.7°F (6.5°C). The coldest month is December, with an average high-temperature of 43.7°F (6.5°C) and an average low-temperature of 35.1°F (1.7°C). Weather in December »
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FAQ

What is the most humid month in Seattle?

January is the most humid month in Seattle, with an average relative humidity of 85%.

How much does it rain in Seattle?

In Seattle, during the entire year, the rain falls for 84.2 days and collects up to 5.2" (132mm) of precipitation.

When does it snow in Seattle?

Months with snowfall are January through March and November.

How many days does it snow in Seattle?

In Seattle, Washington, during the entire year, snow falls for 4.8 days and aggregates up to 0.94" (24mm) of snow.

When is the lowest UV index in Seattle?

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

What is the snowiest month in Seattle?

February is the month with the most snowfall in Seattle. Snow falls for 1.9 days and accumulates 0.71" (18mm) of snow.

When is the ocean coldest in Seattle?

The month with the coldest seawater is February, with an average ocean temperature of 45.3°F (7.4°C).

When is Daylight Saving Time (DST) in Seattle?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, 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 Seattle?

In Seattle, snow does not fall in April through October and December.

When are the longest days in Seattle?

June has the longest days of the year in Seattle, Washington, with an average of 15h and 55min of daylight.

What is the least humid month in Seattle?

July is the least humid month in Seattle, Washington, with an average relative humidity of 69%.

What is the driest month in Seattle?

July and August are months with the least rain when the rain falls for 4.2 days and typically aggregates up to 0.12" (3mm) of rain.

What is the month with the highest UV index in Seattle?

The month with the highest UV index is July, with an average maximum UV index of 6.

What is the warmest month in Seattle?

With an average high-temperature of 76.3°F (24.6°C) and an average low-temperature of 54°F (12.2°C), August is the warmest month in Seattle, Washington.

What month is the ocean warmest in Seattle?

August is the month with the warmest seawater in Seattle, Washington, with an average ocean temperature of 53.6°F (12°C).

What month has the most sunshine in Seattle?

The month with the most sunshine in Seattle, Washington, is August, with an average of 10.7h of sunshine.

What is the coldest month in Seattle?

With an average high-temperature of 43.7°F (6.5°C) and an average low-temperature of 35.1°F (1.7°C), December is the coldest month in Seattle, Washington.

What is the rainiest month in Seattle?

December is the month with the most rainfall in Seattle, Washington. Rain falls for 8.9 days and accumulates 0.87" (22mm) of precipitation.

What is the month with the shortest days in Seattle?

The month with the shortest days in Seattle is December, with an average of 8h and 31min of daylight.

What is the month with the least sunshine in Seattle?

With an average of 4.3h of sunshine, December has the least sunshine of the year in Seattle.

Average temperature
Seattle, WA

Average temperature - Seattle, WA

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).

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Average pressure
Seattle, WA

Average pressure - Seattle, WA

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

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Average wind speed
Seattle, WA

Average wind speed - Seattle, WA

The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

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Average rainfall
Seattle, WA

Average rainfall - Seattle, WA

The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").

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Average rainfall days
Seattle, WA

Average rainfall days - Seattle, WA

The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).

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Average snowfall
Seattle, WA

Average snowfall - Seattle, WA

The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").

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Average snowfall days
Seattle, WA

Average snowfall days - Seattle, WA

The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature
Seattle, WA

Average sea temperature - Seattle, WA

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

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Average daylight / Average sunshine
Seattle, WA

Average daylight / Average sunshine - Seattle, WA

The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 31min).

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days
Seattle, WA

Average sunshine days - Seattle, WA

The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).

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Average UV index
Seattle, WA

Average UV index - Seattle, WA

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
Seattle, WA

Average visibility - Seattle, WA

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

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