S
M
T
W
T
F
S
30
76°
67°
31
85°
69°
1
90°
71°
2
96°
71°
3
87°
70°
4
73°
71°
5
80°
61°
6
79°
57°
7
78°
55°
8
81°
57°
9
77°
68°
10
81°
58°
11
77°
54°
12
82°
60°
13
79°
54°
14
70°
48°
15
81°
57°
16
73°
64°
17
69°
62°
18
74°
54°
19
64°
57°
20
62°
55°
21
64°
47°
22
64°
53°
23
66°
47°
24
66°
47°
25
67°
45°
26
71°
47°
27
69°
48°
28
70°
46°
29
70°
49°
30
69°
48°
1
68°
46°
2
69°
44°
3
63°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ypsilanti
Ypsilanti's September 2026 forecast shows daily high temperatures ranging from 62° to 71°, with overnight lows between 44° and 55°. The average high for September is 67° with an average low of 48°. 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 Ypsilanti. See also: October | November | December.
