S
M
T
W
T
F
S
30
83°
70°
31
91°
73°
1
92°
67°
2
88°
68°
3
84°
72°
4
86°
69°
5
89°
70°
6
83°
66°
7
77°
67°
8
73°
65°
9
75°
61°
10
74°
58°
11
70°
57°
12
69°
56°
13
69°
57°
14
72°
56°
15
77°
62°
16
76°
60°
17
75°
61°
18
76°
63°
19
76°
61°
20
75°
60°
21
76°
63°
22
76°
63°
23
75°
62°
24
76°
62°
25
75°
61°
26
76°
61°
27
75°
60°
28
75°
60°
29
74°
59°
30
73°
59°
1
73°
58°
2
72°
59°
3
73°
58°
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 69° to 92°, with overnight lows between 56° and 72°. The average high for September is 77° with an average low of 62°. 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.
