Weather · Seattle, United States
Seattle Weather in September
September in Seattle averages 21°C by day and 13°C at night, with about 59mm of rain. That makes it a reasonable time to visit.
Avg high
21°C
70°F
Avg low
13°C
55°F
Rainfall
59mm
#9 wettest of 12
What to pack
Layers, plus a jacket for mornings and nights. Rain is unlikely to interrupt your plans.
Timing a trip around the weather? A Local Friend in Seattle builds it around the season for you.