Average data for 10 years
1 September
Sunday
+19°
+16°
2 September
Monday
+20°
+16°
3 September
Tuesday
+17°
+15°
4 September
Wednesday
+16°
+13°
5 September
Thursday
+18°
+13°
6 September
Friday
+17°
+15°
7 September
Saturday
+17°
+14°
8 September
Sunday
+17°
+13°
9 September
Monday
+16°
+12°
10 September
Tuesday
+17°
+14°
11 September
Wednesday
+17°
+13°
12 September
Thursday
+17°
+13°
13 September
Friday
+15°
+12°
14 September
Saturday
+13°
+11°
15 September
Sunday
+15°
+10°
16 September
Monday
+15°
+12°
17 September
Tuesday
+13°
+12°
18 September
Wednesday
+15°
+10°
19 September
Thursday
+17°
+13°
20 September
Friday
+14°
+13°
21 September
Saturday
+14°
+11°
22 September
Sunday
+14°
+11°
23 September
Monday
+15°
+12°
24 September
Tuesday
+14°
+12°
25 September
Wednesday
+14°
+11°
26 September
Thursday
+15°
+12°
27 September
Friday
+15°
+13°
28 September
Saturday
+12°
+9°
29 September
Sunday
+12°
+9°
30 September
Monday
+12°
+9°
Cities near you
United States
Duluth
United States
Medford
United States
Ashland
United States
Minocqua
United States
Cloquet
Cities with similar weather in September
Finland
Helsinki
Latvia
Riga
Estonia
Tallinn
Sweden
Stockholm
Norway
Oslo
In September, the weather in Thunder Bay is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Thunder Bay has 14 partly cloudy, 11 sunny, 4 rainy, and 1 cloudy day in September. The rains are usually moderate.