Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
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 »
[Resources]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
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).
Average pressure
Seattle, WA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.08"Hg
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).
Average wind speed
Seattle, WA
- Average wind speed in January:
5.2mph - Average wind speed in February:
5mph - Average wind speed in March:
5.3mph - Average wind speed in April:
4.7mph - Average wind speed in May:
4mph - Average wind speed in June:
3.9mph
- Average wind speed in July:
3.5mph - Average wind speed in August:
3.5mph - Average wind speed in September:
3.9mph - Average wind speed in October:
4.4mph - Average wind speed in November:
5.1mph - Average wind speed in December:
4.8mph
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 humidity
Seattle, WA
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Seattle, WA
- Average rainfall in January:
0.71" - Average rainfall in February:
0.59" - Average rainfall in March:
0.35" - Average rainfall in April:
0.39" - Average rainfall in May:
0.39" - Average rainfall in June:
0.24"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.12" - Average rainfall in September:
0.28" - Average rainfall in October:
0.51" - Average rainfall in November:
0.63" - Average rainfall in December:
0.87"
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 rainfall days in January:
8.8 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
8.9 days - Average rainfall days in April:
8.1 days - Average rainfall days in May:
7 days - Average rainfall days in June:
5.4 days
- Average rainfall days in July:
4.2 days - Average rainfall days in August:
2.8 days - Average rainfall days in September:
6 days - Average rainfall days in October:
7.2 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
8.9 days
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).
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").
Average snowfall days
Seattle, WA
- Average snowfall days in January:
1.3 days - Average snowfall days in February:
1.9 days - Average snowfall days in March:
0.5 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
0.6 days
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).
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
- Average daylight in January:
8h and 58min - Average daylight in February:
10h and 17min - Average daylight in March:
11h and 57min - Average daylight in April:
13h and 41min - Average daylight in May:
15h and 10min - Average daylight in June:
15h and 55min
- Average daylight in July:
15h and 31min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 33min - Average daylight in October:
10h and 50min - Average daylight in November:
9h and 19min - Average daylight in December:
8h and 31min
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).
- Average sunshine in January:
4h and 24min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 12min - Average sunshine in June:
9h and 24min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 24min - Average sunshine in October:
5h and 36min - Average sunshine in November:
4h and 36min - Average sunshine in December:
4h and 18min
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).
Average sunshine days
Seattle, WA
- Average sunshine days in January:
18.8 days - Average sunshine days in February:
17 days - Average sunshine days in March:
18.6 days - Average sunshine days in April:
18.7 days - Average sunshine days in May:
20.3 days - Average sunshine days in June:
21.8 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
25.9 days - Average sunshine days in September:
21.1 days - Average sunshine days in October:
21.1 days - Average sunshine days in November:
16.8 days - Average sunshine days in December:
17.7 days
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 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).
Average cloud cover
Seattle, WA
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
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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