S
M
T
W
T
F
S
30
87°
68°
31
86°
65°
1
83°
62°
2
87°
66°
3
87°
71°
4
90°
72°
5
81°
68°
6
73°
68°
7
80°
67°
8
85°
58°
9
81°
55°
10
81°
60°
11
83°
59°
12
74°
54°
13
67°
60°
14
73°
50°
15
68°
48°
16
71°
52°
17
70°
49°
18
68°
50°
19
70°
47°
20
71°
49°
21
70°
48°
22
74°
54°
23
75°
54°
24
76°
53°
25
72°
53°
26
71°
52°
27
75°
54°
28
73°
54°
29
71°
52°
30
71°
50°
1
61°
45°
2
59°
40°
3
59°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mankato
Mankato's September 2026 forecast shows daily high temperatures ranging from 59° to 85°, with overnight lows between 39° and 60°. The average high for September is 72° with an average low of 52°. 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 Mankato. See also: October | November | December.
