S
M
T
W
T
F
S
30
75°
54°
31
76°
52°
1
75°
53°
2
76°
52°
3
76°
52°
4
77°
51°
5
77°
51°
6
76°
52°
7
74°
50°
8
75°
49°
9
73°
52°
10
73°
48°
11
74°
47°
12
73°
47°
13
75°
54°
14
75°
48°
15
78°
51°
16
79°
54°
17
79°
55°
18
80°
53°
19
79°
44°
20
72°
45°
21
69°
51°
22
70°
50°
23
72°
51°
24
76°
52°
25
75°
43°
26
74°
41°
27
70°
43°
28
66°
42°
29
66°
42°
30
65°
42°
1
65°
48°
2
Hist. Avg.
69°
46°
3
Hist. Avg.
68°
45°
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 65° to 80°, with overnight lows between 41° and 55°. The average high for September is 74° with an average low of 49°. 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.
