FallPeak season ~71°F highs

Things to do in Seattle in September

September is one of the best months to visit Seattle, with average highs around 71°F. Crisp air and changing leaves make parks and viewpoints shine.

Plan a September weekend Where else in September

Best picks for September

What's famous here, weighted toward what shines in September.

1Foliage walks

Olympic National Park

national park on the Olympic Peninsula in Washington State, USA

Space Needle

observation tower in Seattle, Washington, United States

Trieste II

The underwater vessel that brought man to the deepese ocean in 1960

Holidays in September 2027

Labour Day · Mon, Sep 6

Expect busier roads and pricier stays around these dates. See long weekends.

Also great in September in Washington

Bellingham Vancouver Spokane

Seattle in September: quick answers

Is September a good time to visit Seattle?

September is one of the best months to visit Seattle, with average highs around 71°F. Crisp air and changing leaves make parks and viewpoints shine.

What is the weather like in Seattle in September?

Average daytime highs are around 71°F, compared with 79°F in the warmest month. Check the forecast a week out; our planner favors indoor stops on rainy days.

What are the best things to do in Seattle in September?

Top picks for September: Olympic National Park, Space Needle, Trieste II, Little Si, Wenatchee National Forest.