S
M
T
W
T
F
S
30
75°
59°
31
76°
60°
1
74°
55°
2
80°
62°
3
83°
59°
4
84°
56°
5
78°
50°
6
78°
51°
7
77°
58°
8
80°
54°
9
80°
48°
10
72°
47°
11
70°
46°
12
70°
48°
13
72°
52°
14
71°
45°
15
69°
43°
16
67°
43°
17
68°
44°
18
68°
43°
19
67°
44°
20
68°
44°
21
68°
48°
22
72°
52°
23
73°
45°
24
76°
52°
25
73°
50°
26
74°
40°
27
65°
49°
28
67°
49°
29
67°
47°
30
68°
46°
1
65°
43°
2
62°
42°
3
63°
48°
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 62° to 84°, with overnight lows between 40° and 62°. The average high for September is 72° 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 Mankato. See also: October | November | December.
