S
M
T
W
T
F
S
30
88°
56°
31
90°
53°
1
86°
51°
2
85°
45°
3
79°
50°
4
80°
51°
5
83°
53°
6
88°
51°
7
86°
47°
8
75°
44°
9
75°
43°
10
76°
43°
11
76°
46°
12
77°
45°
13
75°
50°
14
79°
51°
15
77°
51°
16
84°
50°
17
77°
45°
18
73°
49°
19
72°
46°
20
77°
42°
21
80°
41°
22
75°
39°
23
71°
41°
24
75°
43°
25
80°
46°
26
71°
44°
27
71°
38°
28
71°
41°
29
Hist. Avg.
70°
41°
30
Hist. Avg.
70°
40°
1
Hist. Avg.
69°
40°
2
Hist. Avg.
69°
40°
3
Hist. Avg.
68°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in LaCrosse
LaCrosse's September 2026 forecast shows daily high temperatures ranging from 71° to 90°, with overnight lows between 38° and 56°. The average high for September is 78° with an average low of 47°. 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 LaCrosse. See also: October | November | December.
