Seattle (WA) Climate by Month
Seattle has a temperate climate and experiences warm summers and mild winters. Most rain in Seattle is seen in winter and on an annual base the city experiences a large amount of rainfall making it one of the wettest cities in the country.
Winters in Seattle have an average maximum temperature of between 8°C and 11°C, so snowfall is rare. Summers have an average maximum temperature of 20°C to 25°C.
The best time to travel to Seattle in Washington State is from May to September. During this period you have a pleasant temperature and almost no precipitation. The city can be a bit busy during this period so it is recommended to book a place to stay in advance.
Average day and night temperature
In Seattle, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 25°C in July. In December, the coolest month of the year, temperatures drop to a chilly 8°C. At night, expect cooler temperatures, averaging 2°C during this month.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Seattle experiences significant rain/snowfall throughout the year, averaging 1009 mm of precipitation annually. Seattle can be quite wet during November, receiving approximately 166 mm of precipitation over 20 rainy days. In contrast July, experiences much drier conditions, with 14 mm of rainfall, spread across 4 rainy days.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seattle can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.8 hours of sunlight per day.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is moderate throughout the year in Seattle.
Relative humidity over the year
Average wind speed
The mean wind speed over the year in Seattle ranges from 4°C in February to 5°C in January.
The mean monthly wind speed over the year (meters per second)
The best time of year to visit Seattle in the United States of America
During the months of June, July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
July has an average maximum temperature of 25°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 8°C.
November tops the wettest month list with 166 mm of rainfall.
July is the driest month with 14 mm of precipitation.
July is the sunniest month with an average of 312 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
