Seattle · September
Run in the morning.
Cool month: average high 69°F, low 55°F. Humidity averages 75% — the limiting factor on most runs. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
69° / 55°F
Humidity
75%
Rain days
13/mo
Wind
10 mph
What September feels like in Seattle
Sunrise
06:47
Mid-month average
Sunset
19:20
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Seattle in September
The kit for September in Seattle: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
-8° avg high
+6 rain days
Seattle in August →
September
69°F avg high
13 rain days
Best: morning
vs October
+10° avg high
-4 rain days
Seattle in October →
Frequently Asked Questions
What is the best time of day to run in Seattle in September?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Seattle in September?+
Average high 69°F, average low 55°F.
How does September compare to surrounding months in Seattle?+
Compared to August (avg high 77°F), September is cooler. Compared to October (avg high 60°F), September is warmer.
Does it rain often in Seattle in September?+
Expect about 13 measurable rain days in September, on average.