S
M
T
W
T
F
S
30
80°
62°
31
76°
67°
1
75°
63°
2
72°
63°
3
86°
69°
4
84°
70°
5
79°
65°
6
73°
52°
7
78°
57°
8
80°
62°
9
81°
71°
10
84°
62°
11
75°
56°
12
75°
63°
13
79°
65°
14
81°
63°
15
77°
64°
16
73°
57°
17
71°
59°
18
74°
60°
19
72°
57°
20
76°
59°
21
75°
60°
22
68°
60°
23
68°
59°
24
69°
59°
25
70°
57°
26
72°
57°
27
68°
53°
28
68°
57°
29
73°
58°
30
74°
58°
1
74°
57°
2
72°
58°
3
71°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Trumbull
Trumbull's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 52° and 71°. The average high for September is 74° with an average low of 59°. 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 Trumbull. See also: October | November | December.
