S
M
T
W
T
F
S
30
74°
64°
31
76°
64°
1
80°
63°
2
80°
57°
3
77°
56°
4
72°
63°
5
71°
63°
6
79°
57°
7
72°
54°
8
69°
54°
9
71°
60°
10
70°
62°
11
71°
61°
12
77°
61°
13
77°
54°
14
69°
53°
15
66°
52°
16
66°
56°
17
67°
52°
18
66°
51°
19
68°
48°
20
65°
50°
21
65°
57°
22
66°
53°
23
73°
51°
24
70°
58°
25
72°
59°
26
71°
59°
27
73°
56°
28
72°
50°
29
70°
53°
30
61°
55°
1
67°
53°
2
70°
56°
3
68°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in La Crosse
La Crosse's September 2026 forecast shows daily high temperatures ranging from 61° to 80°, with overnight lows between 48° and 64°. The average high for September is 71° with an average low of 56°. 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 La Crosse. See also: October | November | December.
