The best times to visit Seattle for ideal weather are

May 7th to October 21st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Seattle Travel Info

Weather in Seattle

Temperature

Average temperatures in Seattle vary greatly. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 37th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Seattle, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally mid August where highs are regularly around 81°F (27.2°C) with temperatures rarely dropping below 60°F (15.6°C) at night.

Seattle Temperatures (Fahrenheit)

Key
High
Average
Low

Seattle Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Seattle Perceived Temperature (F)

Key
High
Average
Low

Seattle Perceived Temperature (C)

Key
High
Average
Low

 

Average Seattle Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 48.4 42.2 36.8
Feb 51.5 44.3 38.3
Mar 55.1 46.9 40.3
Apr 59.7 50.2 43
May 67 56.8 49
Jun 72.2 61.9 54.2
Jul 79.6 67.4 58.3
Aug 78.9 67.4 58.7
Sep 72.9 62.6 54.8
Oct 62.1 54.2 47.8
Nov 53.4 46.5 40.5
Dec 47.7 41.8 36.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 9.1 5.7 2.7
Feb 10.8 6.8 3.5
Mar 12.8 8.3 4.6
Apr 15.4 10.1 6.1
May 19.4 13.8 9.4
Jun 22.3 16.6 12.3
Jul 26.4 19.7 14.6
Aug 26.1 19.7 14.8
Sep 22.7 17 12.7
Oct 16.7 12.3 8.8
Nov 11.9 8.1 4.7
Dec 8.7 5.4 2.5

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Seattle are July, August, and then June. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid July. For example, on the week of July 9th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 4 days of significant precipitation the week of December 17th.

When can you find snow in Seattle? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Seattle.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Seattle (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 34% 0 4.3
Feb 30% 0 3.1
Mar 36% 0 4.8
Apr 29% 0 2.9
May 21% 0 2.2
Jun 14% 0 1.2
Jul 4% 0 0.4
Aug 7% 0 0.8
Sep 14% 0 1.8
Oct 30% 0 3.8
Nov 39% 0 5.6
Dec 38% 0 5.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 34 0 10.9
Feb 30 0 7.9
Mar 36 0 12.2
Apr 29 0 7.4
May 21 0 5.6
Jun 14 0 3
Jul 4 0 1
Aug 7 0 2
Sep 14 0 4.6
Oct 30 0 9.7
Nov 39 0 14.2
Dec 38 0 14.7

 

Humidity and Wind

Seattle has some very humid months, with other comfortably humid months. The least humid month is July (50.1% relative humidity), and the most humid month is January (72.7%).

Wind in Seattle is usually calm. The windiest month is March, followed by April and December. March’s average wind speed of around 5.3 knots (6.1 MPH or 9.9 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid March where average top sustained speeds reach 11.8 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Seattle.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 4.5 Light breeze 10.1 Gentle breeze
Feb 4.6 Light breeze 10.2 Gentle breeze
Mar 5.3 Light breeze 11.1 Gentle breeze
Apr 4.9 Light breeze 10.2 Gentle breeze
May 4.3 Light breeze 9.1 Gentle breeze
Jun 4.3 Light breeze 9.1 Gentle breeze
Jul 3.9 Barely noticeable 8.6 Gentle breeze
Aug 3.7 Barely noticeable 8.5 Gentle breeze
Sep 3.7 Barely noticeable 8.5 Gentle breeze
Oct 3.9 Barely noticeable 9.2 Gentle breeze
Nov 4.5 Light breeze 10.4 Gentle breeze
Dec 4.7 Light breeze 10.3 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 72.7%
Feb 66.7%
Mar 63.4%
Apr 57.8%
May 55%
Jun 53.4%
Jul 50.1%
Aug 52.1%
Sep 59.2%
Oct 68.6%
Nov 70.2%
Dec 70.4%

 

Is it Safe to Travel to Seattle?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Seattle, WA, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Seattle in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is very reliable. Displayed data is calculated relative to the peak, so a score of 38 in November means 38% of the tourists vs. July.

 

 

Overall Seattle Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 70.3°F (21.3°C) and 52.2°F (11.2°C) with warmer temperatures in the later months. Rain is somewhat common with 6 to 11 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with 1 to 4 days of precipitation per month. June – August is the busiest season for tourism in Seattle, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 75.5°F (24.2°C) and 49.9°F (9.9°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 4 to 12 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Seattle to be enjoyable for warm weather travelers. The average high during this season is between 53.3°F (11.8°C) and 46.5°F (8.1°C). On average, it rains or snows a great amount: 8 to 12 times per month. These times of year are fairly slow with tourists.

 

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