Seattle · August
Run in the morning.
Comfortable average high of 77°F, dipping to 59°F at night. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
Avg high / low
77° / 59°F
Humidity
68%
Rain days
7/mo
Wind
10 mph
What August feels like in Seattle
Sunrise
06:07
Mid-month average
Sunset
20:19
Mid-month average
Time-of-day breakdown
Morning
Steady cool air, low wind, and good light. The standard runner window in most months.
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 August
The kit for August in Seattle: shorts and a short-sleeve are the standard kit.
August vs the surrounding months
vs July
+1° avg high
+1 rain days
Seattle in July →
August
77°F avg high
7 rain days
Best: morning
vs September
+8° avg high
-6 rain days
Seattle in September →
Frequently Asked Questions
What is the best time of day to run in Seattle in August?+
Morning. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
What's the average temperature in Seattle in August?+
Average high 77°F, average low 59°F.
How does August compare to surrounding months in Seattle?+
Compared to July (avg high 76°F), August is warmer. Compared to September (avg high 69°F), August is warmer.
Does it rain often in Seattle in August?+
Expect about 7 measurable rain days in August, on average.