The best times to visit Northwest Washington for ideal weather are

May 21st to September 30th

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

 

 


Other Northwest Washington Travel Info

Weather in Northwest Washington

Temperature

Average temperatures in Northwest Washington vary greatly. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 30th 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 Northwest Washington, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid August where highs are regularly around 76.7°F (24.8°C) with temperatures rarely dropping below 55.1°F (12.8°C) at night.

Northwest Washington Temperatures (Fahrenheit)

Key
High
Average
Low

Northwest Washington 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.

Northwest Washington Perceived Temperature (F)

Key
High
Average
Low

Northwest Washington Perceived Temperature (C)

Key
High
Average
Low

 

Average Northwest Washington 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

MonthAvg. High (°F)Avg. Mean (°F)Avg. Low (°F)
Jan46.239.233.7
Feb49.541.735.5
Mar52.744.537.6
Apr57.348.140.4
May64.154.245.7
Jun68.458.951
Jul74.663.454.5
Aug74.563.354.3
Sep69.358.549.5
Oct59.851.143.8
Nov50.843.737.5
Dec44.73933.5

Show Celsius

MonthAvg. High (°C)Avg. Mean (°C)Avg. Low (°C)
Jan7.940.9
Feb9.75.41.9
Mar11.56.93.1
Apr14.18.94.7
May17.812.37.6
Jun20.214.910.6
Jul23.717.412.5
Aug23.617.412.4
Sep20.714.79.7
Oct15.410.66.6
Nov10.46.53.1
Dec7.13.90.8

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Northwest Washington 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 July. For example, on the week of July 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid March with an average of 4 days of significant precipitation the week of March 12th.

When can you find snow in Northwest Washington? 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 Northwest Washington.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

MonthDaily Chance of RainAverage Snow Depth (in)Total Precipitation (in)
Jan32%04.1
Feb29%02.5
Mar39%04.3
Apr30%02.8
May22%02.6
Jun17%01.7
Jul8%00.8
Aug10%01
Sep21%02.2
Oct30%03.6
Nov39%04.6
Dec33%03.9

Show Centimeters

MonthDaily Chance of RainAverage Snow Depth (cm)Total Precipitation (cm)
Jan32010.4
Feb2906.4
Mar39010.9
Apr3007.1
May2206.6
Jun1704.3
Jul802
Aug1002.5
Sep2105.6
Oct3009.1
Nov39011.7
Dec3309.9

 

Humidity and Wind

Northwest Washington has some very humid months, and above average humidity throughout the year. The least humid month is April (61.3% relative humidity), and the most humid month is October (74.3%).

Wind in Northwest Washington is usually calm. The windiest month is December, followed by March and November. December’s average wind speed of around 6.5 knots (7.5 MPH or 12.1 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 mid to late November where average top sustained speeds reach 15 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

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.

MonthAvg. WindAvg. Wind FeelSustained High WindHigh Wind Feel
Jan5.5Light breeze12.3Significant breeze
Feb5.8Light breeze12.6Significant breeze
Mar6.3Light breeze13.6Significant breeze
Apr5.2Light breeze11.7Significant breeze
May4.8Light breeze10.1Significant breeze
Jun5.5Light breeze10.6Gentle breeze
Jul5.6Light breeze10.2Significant breeze
Aug4.9Light breeze9.9Gentle breeze
Sep3.9Barely noticeable9.6Significant breeze
Oct4.3Light breeze10.8Gentle breeze
Nov6.1Light breeze13.6Significant breeze
Dec6.5Light breeze13.2Significant breeze

Show Relative Humidity by Month

MonthAvg. Relative Humidity
Jan74.2%
Feb67.1%
Mar65.5%
Apr61.3%
May64.7%
Jun64.3%
Jul64%
Aug66.5%
Sep71.2%
Oct74.3%
Nov70.9%
Dec69.8%

 

Is it Safe to Travel to Northwest Washington?

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 Northwest Washington, the United States is July, followed by May and June. 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 Northwest Washington in December. 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 somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.3 in December means 36.3% of the tourists vs. July.

 

 

Overall Northwest Washington Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 66.8°F (19.3°C) and 49.3°F (9.6°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 12 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see the least precipitation with 3 to 5 days of precipitation per month. June – August is the busiest season for tourism in Northwest Washington, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 72.1°F (22.3°C) and 46.8°F (8.2°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 6 to 12 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is too cold this time of year in Northwest Washington to be enjoyable for warm weather travelers. The average high during this season is between 51.5°F (10.8°C) and 43.7°F (6.5°C). On average, it rains or snows a fair amount: 8 to 10 times per month. These times of year are the slowest with tourists.

 

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