Average data for 10 years
1 September
Monday
+16°
+8°
2 September
Tuesday
+16°
+8°
3 September
Wednesday
+16°
+9°
4 September
Thursday
+15°
+9°
5 September
Friday
+16°
+9°
6 September
Saturday
+16°
+9°
7 September
Sunday
+16°
+9°
8 September
Monday
+16°
+9°
9 September
Tuesday
+15°
+9°
10 September
Wednesday
+15°
+8°
11 September
Thursday
+16°
+8°
12 September
Friday
+15°
+8°
13 September
Saturday
+14°
+8°
14 September
Sunday
+14°
+8°
15 September
Monday
+14°
+8°
16 September
Tuesday
+13°
+8°
17 September
Wednesday
+13°
+7°
18 September
Thursday
+14°
+7°
19 September
Friday
+13°
+7°
20 September
Saturday
+13°
+7°
21 September
Sunday
+13°
+7°
22 September
Monday
+12°
+7°
23 September
Tuesday
+12°
+6°
24 September
Wednesday
+12°
+6°
25 September
Thursday
+13°
+6°
26 September
Friday
+12°
+6°
27 September
Saturday
+12°
+6°
28 September
Sunday
+12°
+6°
29 September
Monday
+11°
+6°
30 September
Tuesday
+11°
+5°
Cities with similar weather in September
Finland
Helsinki
Latvia
Riga
Estonia
Tallinn
Sweden
Stockholm
Kyrgyzstan
Cholpon-Ata
In September, the weather in Trondheim is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Trondheim has 16 rainy, 5 cloudy, 5 partly cloudy, and 4 sunny days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Trondheim.