S
M
T
W
T
F
S
30
N/A
31
88°
70°
1
90°
71°
2
95°
68°
3
86°
64°
4
84°
61°
5
79°
58°
6
81°
58°
7
84°
60°
8
81°
59°
9
77°
55°
10
76°
52°
11
77°
52°
12
79°
56°
13
80°
57°
14
79°
56°
15
78°
57°
16
79°
56°
17
78°
55°
18
75°
54°
19
78°
56°
20
79°
56°
21
79°
55°
22
78°
55°
23
79°
54°
24
78°
54°
25
77°
53°
26
78°
52°
27
77°
53°
28
77°
52°
29
76°
51°
30
74°
50°
1
73°
50°
2
74°
51°
3
75°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ann Arbor
Ann Arbor's September 2026 forecast shows daily high temperatures ranging from 73° to 95°, with overnight lows between 50° and 71°. The average high for September is 79° with an average low of 56°. 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 Ann Arbor. See also: October | November | December.
