S
M
T
W
T
F
S
29
82°
53°
30
83°
60°
31
82°
65°
1
82°
70°
2
79°
71°
3
83°
71°
4
77°
55°
5
70°
54°
6
73°
47°
7
77°
54°
8
79°
56°
9
78°
62°
10
80°
65°
11
77°
64°
12
79°
63°
13
79°
64°
14
78°
55°
15
81°
61°
16
80°
60°
17
76°
61°
18
76°
60°
19
75°
61°
20
78°
61°
21
80°
60°
22
81°
62°
23
80°
63°
24
81°
63°
25
79°
62°
26
79°
62°
27
81°
61°
28
81°
63°
29
80°
63°
30
78°
61°
1
80°
64°
2
79°
63°
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 70° to 83°, with overnight lows between 47° and 71°. The average high for April is 79° with an average low of 61°. 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.
