Weather in September in Washington State
Are you planning a trip a to Washington State in September and wondering what kind of weather to expect? This page has all the details you need.
What is the weather like in Washington State in September?
Washington State is a region in the United States of America. Washington State offers a broad spectrum of weather patterns. In September, one might encounter temperatures that range from cold to warm, and precipitation levels ranging from low to high. September is a summer month.
Temperatures
The average maximum daytime temperatures vary from cold in Mount Rainier National Park at 8°C to warm in Pasco at 27°C. Nighttime temperatures generally drop to 10°C in Pasco and -3°C in Mount Rainier National Park .
Precipitation
In September, precipitation varies across different areas. From low rainfall in Moses Lake with an average of 6.1 mm to high rainfall in North Cascades National Park with 134 mm.Average sunshine
The days are mostly sunny, with an average total of around 220 hours of sunshine in Seattle. The sunlight during this month doesn't just make the days brighter, it also seems to make everyone a bit more cheerful.For a closer look at September's conditions in Washington State, see the map below. For a more detailed look at Washington State's yearly weather, check out our Washington State climate page.
Where to go in Washington State in September
perfect weather
pleasant
tolerable
unpleasant
poor
Popular destinations
What is the weather like in September for the 5 most popular destinations in Washington State?
Seattle
In September Seattle generally has pleasant temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 12°C and moderate monthly rainfall. So on average the conditions are perfect that month.
Max temperature
Max temp
Min temperature
Min temp
Monthly sun hours
Sun hours
Monthly rainfall
Rainfall
Monthly rainy days
Rainy days
Weather conditions
Weather
SeaTac
In September SeaTac generally has pleasant temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 12°C and moderate monthly rainfall. So on average the conditions are perfect that month.
Max temperature
Max temp
Min temperature
Min temp
Monthly sun hours
Sun hours
Monthly rainfall
Rainfall
Monthly rainy days
Rainy days
Weather conditions
Weather
Ocean Shores
In September Ocean Shores generally has pleasant temperatures with maximum daytime temperatures around 19°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are pleasant that month.
Max temperature
Max temp
Min temperature
Min temp
Monthly rainfall
Rainfall
Monthly rainy days
Rainy days
Weather conditions
Weather
Bellevue
In September Bellevue generally has pleasant temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are perfect that month.
Max temperature
Max temp
Min temperature
Min temp
Monthly sun hours
Sun hours
Monthly rainfall
Rainfall
Monthly rainy days
Rainy days
Weather conditions
Weather
Vancouver
In September Vancouver generally has high temperatures with maximum daytime temperatures around 24°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are perfect that month.
Max temperature
Max temp
Min temperature
Min temp
Monthly sun hours
Sun hours
Monthly rainfall
Rainfall
Monthly rainy days
Rainy days
Weather conditions
Weather
Is your destination not in the list? Have a look at other destinations in Washington State, in the United States of America.
Is September the best time to visit Washington State?
We consider September to be one of the best times to travel to Washington State. Typically, the climate in Seattle is perfect. However, the weather conditions may vary depending on your destination.
Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly perfect weather in Seattle. On the other hand, the weather in January, February, March, November and December tend to be poor.
Interested in more climate information?
We have much more information about the climate in Washington State.
Interested in the weather conditions in a specific month? Select the month below.
Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.
Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.