Seattle Weather in September

Average temperatures in Seattle during September is 14, with highs being around 20 and lows around 11. Discover more info below:
 

Month Degrees Celsius
Temperature 14
High Temperature 20
Low Temperature 11
Sunshine Per Day 8
 

Seattle, Washington (USA) Weather in September FAQs

What is the average weather?

14

What’s the difference in temperature between summer and winter?

On average the summer and winter weather differs by 7.

Will I see a lot of sun?

You should expect 8 of sunshine per day

Useful Links: Seattle Weather: Average Weather & Yearly Climate