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, the same as December, in Seattle, Washington, is a frosty winter month, with average temperature varying between 36°F (2.2°C) and 45°F (7.2°C). In January, the average high-temperature is almost the same as in December - a still frosty 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 average temperature varying between 35.2°F (1.8°C) and 46.2°F (7.9°C). In February, the average high-temperature is almost the same as in January - a still chilly 46.2°F (7.9°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Seattle, Washington, with average temperature varying between 50.5°F (10.3°C) and 37.4°F (3°C). In Seattle, the average high-temperature in March is relatively 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 moderate spring month, with average temperature varying between 40.5°F (4.7°C) and 56.5°F (13.6°C). In Seattle, Washington, the average high-temperature slightly increases, 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

The last month of the spring, May, is a comfortable month in Seattle, Washington, with average temperature fluctuating between 44.8°F (7.1°C) and 64.8°F (18.2°C). In May, the average high-temperature slightly increases, from a moderate 56.5°F (13.6°C) in April, to an enjoyable 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 high of 69.1°F (20.6°C) and an average low of 48.4°F (9.1°C). In Seattle, Washington, 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 in Seattle, Washington, is a moderately hot summer month, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 75.9°F (24.4°C). In July, the average high-temperature slightly increases, 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 average temperature varying between 54°F (12.2°C) and 76.3°F (24.6°C). 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. Weather in August »

Weather in September

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

Weather in October

October, the same as September, in Seattle, Washington, is another mild autumn month, with average temperature ranging between max 58.6°F (14.8°C) and min 45.3°F (7.4°C). In Seattle, the average high-temperature in October decreases, from an agreeable 69.6°F (20.9°C) in September, to a mild 58.6°F (14.8°C). Weather in October »

Weather in November

November, the last month of the autumn, in Seattle, is also a frosty month, with average temperature ranging between max 49.1°F (9.5°C) and min 39.4°F (4.1°C). In November, the average high-temperature drops, 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

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

What is the most humid month in Seattle?

With an average relative humidity of 85%, January is the most humid month.

How much does it rain in Seattle?

In Seattle, Washington, 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?

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

What is the snowiest month in Seattle?

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

When is the ocean coldest in Seattle?

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

When it does not snow in Seattle?

In Seattle, Washington, 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, with an average of 15.9h of daylight.

What is the least humid month in Seattle?

With an average relative humidity of 69%, July is the least humid month.

What is the driest month in Seattle?

Months with the least rainfall are July and August Rain falls for 4.2 days and accumulates 0.12" (3mm) of rain.

When is the highest UV index in Seattle?

July is the month with the highest UV index, 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?

August has the most sunshine of the year in Seattle, Washington, with an average of 10.7h of sunshine.

What is the coldest month in Seattle?

The coldest month in Seattle, Washington, 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).

What is the rainiest month in Seattle?

December is the month with the most rainfall in Seattle. 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 is December, with an average of 8.5h 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, Washington.

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").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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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").
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).
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: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.3h).

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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 visibility
Seattle, WA

Average visibility - Seattle, WA

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

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