S
M
T
W
T
F
S
30
66°
49°
31
64°
47°
1
65°
49°
2
64°
48°
3
64°
48°
4
62°
46°
5
63°
45°
6
63°
42°
7
57°
41°
8
56°
44°
9
55°
44°
10
55°
41°
11
57°
39°
12
56°
40°
13
55°
39°
14
54°
38°
15
53°
39°
16
54°
38°
17
53°
39°
18
55°
39°
19
53°
40°
20
52°
39°
21
Hist. Avg.
54°
44°
22
Hist. Avg.
54°
44°
23
Hist. Avg.
54°
43°
24
Hist. Avg.
54°
43°
25
Hist. Avg.
53°
43°
26
Hist. Avg.
53°
43°
27
Hist. Avg.
53°
43°
28
Hist. Avg.
53°
42°
29
Hist. Avg.
52°
42°
30
Hist. Avg.
52°
42°
1
Hist. Avg.
52°
42°
2
Hist. Avg.
52°
42°
3
Hist. Avg.
51°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Trondheim
Trondheim's September 2026 forecast shows daily high temperatures ranging from 52° to 66°, with overnight lows between 38° and 49°. The average high for September is 58° with an average low of 42°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Trondheim. See also: October | November | December.
