S
M
T
W
T
F
S
30
82°
60°
31
77°
60°
1
76°
61°
2
76°
60°
3
77°
64°
4
75°
59°
5
80°
59°
6
76°
58°
7
75°
57°
8
74°
58°
9
74°
58°
10
77°
64°
11
79°
62°
12
73°
61°
13
72°
63°
14
79°
62°
15
Hist. Avg.
76°
60°
16
Hist. Avg.
76°
60°
17
Hist. Avg.
75°
60°
18
Hist. Avg.
75°
59°
19
Hist. Avg.
74°
59°
20
Hist. Avg.
74°
58°
21
Hist. Avg.
74°
58°
22
Hist. Avg.
73°
58°
23
Hist. Avg.
73°
57°
24
Hist. Avg.
73°
57°
25
Hist. Avg.
72°
56°
26
Hist. Avg.
72°
56°
27
Hist. Avg.
72°
56°
28
Hist. Avg.
71°
55°
29
Hist. Avg.
71°
55°
30
Hist. Avg.
70°
54°
1
Hist. Avg.
70°
54°
2
Hist. Avg.
70°
54°
3
Hist. Avg.
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Trumbull
Trumbull's September 2026 forecast shows daily high temperatures ranging from 72° to 82°, with overnight lows between 57° and 64°. The average high for September is 76° with an average low of 60°. 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.
