S
M
T
W
T
F
S
29
69°
41°
30
79°
41°
31
61°
41°
1
47°
33°
2
38°
33°
3
40°
37°
4
44°
35°
5
57°
32°
6
47°
29°
7
45°
22°
8
70°
40°
9
55°
35°
10
54°
37°
11
54°
32°
12
76°
49°
13
76°
55°
14
76°
52°
15
64°
54°
16
75°
52°
17
78°
44°
18
46°
33°
19
49°
33°
20
59°
28°
21
80°
50°
22
80°
47°
23
81°
59°
24
64°
45°
25
70°
47°
26
71°
53°
27
64°
44°
28
59°
41°
29
60°
36°
30
58°
40°
1
52°
37°
2
62°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Onalaska
Onalaska's April 2026 forecast shows daily high temperatures ranging from 52° to 71°, with overnight lows between 36° and 53°. The average high for April is 62° with an average low of 43°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Onalaska. See also: May | June | July.
