Monthly weather forecast and climate
Seattle, WA

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

The last month of the winter, February, is another chilly month in Seattle, Washington, with average temperature fluctuating between 35.2°F (1.8°C) and 46.2°F (7.9°C). In February, the average high-temperature is essentially the same as in January - a still frosty 46.2°F (7.9°C). Weather in February »

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

April is a moderate spring month in Seattle, Washington, with average temperature ranging between max 56.5°F (13.6°C) and min 40.5°F (4.7°C). In April, the average high-temperature 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 »

The last month of the spring, May, is an enjoyable month in Seattle, Washington, with average temperature fluctuating between 44.8°F (7.1°C) and 64.8°F (18.2°C). In Seattle, the average high-temperature slightly increases, from a mild 56.5°F (13.6°C) in April, to an enjoyable 64.8°F (18.2°C). Weather in May »

June, the first month of the summer, in Seattle, is an agreeable month, with average temperature fluctuating between 48.4°F (9.1°C) and 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 »

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

The last month of the summer, August, is another warm month in Seattle, Washington, with average temperature ranging between max 76.3°F (24.6°C) and min 54°F (12.2°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 »

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

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

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

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

What is the most humid month in Seattle?

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

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 in Seattle, Washington, are January through March and November.

How much does it snow in Seattle?

Throughout the year, in Seattle, Washington, there are 4.8 snowfall days, and 0.94" (24mm) of snow is accumulated.

What are the months with the lowest UV index in Seattle?

Months with the lowest UV index in Seattle, Washington, 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. Snow falls for 1.9 days and accumulates 0.71" (18mm) of snow.

What is the month with the coldest ocean 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?

April through October and December are months without snowfall in Seattle.

When are the longest days in Seattle?

June has the longest days of the year in Seattle, 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 in Seattle, Washington.

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?

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

What month is the ocean warmest in Seattle?

August is the month with the warmest seawater, 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?

December is the coldest month, 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 wettest month in Seattle?

December is the month with the most rainfall. 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 8.5h of daylight.

What is the month with the least sunshine in Seattle?

December has the least sunshine of the year in Seattle, with an average of 4.3h of sunshine.
Average temperature - 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").

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).

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").

Average rainfall days - 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").

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).

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).

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).

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).

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).