S
M
T
W
T
F
S
30
75°
53°
31
75°
54°
1
76°
53°
2
74°
52°
3
75°
52°
4
76°
53°
5
77°
57°
6
76°
55°
7
74°
55°
8
75°
54°
9
73°
50°
10
76°
49°
11
73°
49°
12
74°
51°
13
74°
49°
14
72°
55°
15
78°
57°
16
80°
57°
17
78°
56°
18
78°
47°
19
76°
45°
20
70°
46°
21
69°
52°
22
72°
53°
23
76°
54°
24
75°
53°
25
76°
43°
26
75°
42°
27
66°
42°
28
65°
43°
29
66°
43°
30
66°
41°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
47°
3
Hist. Avg.
69°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Morris
Mount Morris's September 2026 forecast shows daily high temperatures ranging from 65° to 80°, with overnight lows between 41° and 57°. The average high for September is 74° with an average low of 50°. 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 Mount Morris. See also: October | November | December.
