Average data for 10 years
1 September
Monday
+21°
+14°
2 September
Tuesday
+21°
+13°
3 September
Wednesday
+21°
+14°
4 September
Thursday
+21°
+13°
5 September
Friday
+21°
+13°
6 September
Saturday
+21°
+14°
7 September
Sunday
+21°
+14°
8 September
Monday
+20°
+14°
9 September
Tuesday
+21°
+13°
10 September
Wednesday
+20°
+13°
11 September
Thursday
+21°
+13°
12 September
Friday
+21°
+13°
13 September
Saturday
+20°
+13°
14 September
Sunday
+20°
+13°
15 September
Monday
+20°
+13°
16 September
Tuesday
+19°
+13°
17 September
Wednesday
+18°
+13°
18 September
Thursday
+18°
+13°
19 September
Friday
+18°
+12°
20 September
Saturday
+18°
+12°
21 September
Sunday
+18°
+12°
22 September
Monday
+19°
+12°
23 September
Tuesday
+19°
+12°
24 September
Wednesday
+19°
+12°
25 September
Thursday
+19°
+13°
26 September
Friday
+18°
+12°
27 September
Saturday
+18°
+12°
28 September
Sunday
+18°
+11°
29 September
Monday
+18°
+12°
30 September
Tuesday
+17°
+11°
Cities near you
Canada
Vancouver
United States
Portland
United States
Salem
Canada
Victoria
United States
Eugene
Cities with similar weather in September
United States
San Francisco
Montenegro
Podgorica
Canada
Toronto
Italy
Genoa
United States
Boston
In September, the weather in Seattle is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Seattle has 12 sunny, 10 rainy, and 8 partly cloudy days in September. The rains are usually heavy.