S
M
T
W
T
F
S
30
72°
63°
31
70°
62°
1
71°
59°
2
71°
57°
3
73°
64°
4
N/A
5
70°
50°
6
76°
62°
7
81°
60°
8
65°
51°
9
65°
49°
10
64°
54°
11
66°
53°
12
64°
51°
13
64°
50°
14
66°
52°
15
64°
51°
16
65°
52°
17
64°
48°
18
66°
49°
19
69°
53°
20
65°
53°
21
68°
52°
22
69°
52°
23
69°
51°
24
66°
50°
25
69°
54°
26
68°
52°
27
67°
52°
28
66°
51°
29
65°
51°
30
66°
48°
1
60°
46°
2
58°
45°
3
59°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St.-Truiden
St.-Truiden's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 44° and 62°. The average high for September is 66° with an average low of 51°. 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 St.-Truiden. See also: October | November | December.
