S
M
T
W
T
F
S
30
94°
73°
31
93°
73°
1
98°
70°
2
98°
72°
3
96°
74°
4
97°
73°
5
99°
73°
6
94°
71°
7
95°
77°
8
103°
70°
9
87°
63°
10
83°
61°
11
88°
65°
12
89°
66°
13
88°
63°
14
87°
62°
15
85°
60°
16
86°
59°
17
89°
57°
18
77°
52°
19
80°
56°
20
83°
58°
21
83°
57°
22
83°
57°
23
82°
56°
24
80°
57°
25
78°
57°
26
79°
56°
27
80°
56°
28
79°
55°
29
76°
55°
30
76°
49°
1
67°
43°
2
66°
41°
3
65°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tecumseh
Tecumseh's September 2026 forecast shows daily high temperatures ranging from 65° to 103°, with overnight lows between 39° and 77°. The average high for September is 83° with an average low of 58°. 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 Tecumseh. See also: October | November | December.
