S
M
T
W
T
F
S
26
89°
61°
27
84°
58°
28
80°
60°
29
82°
62°
30
81°
61°
31
80°
60°
1
81°
61°
2
85°
60°
3
84°
61°
4
83°
60°
5
90°
68°
6
81°
63°
7
80°
67°
8
Hist. Avg.
84°
64°
9
Hist. Avg.
84°
63°
10
Hist. Avg.
84°
63°
11
Hist. Avg.
84°
63°
12
Hist. Avg.
84°
63°
13
Hist. Avg.
84°
63°
14
Hist. Avg.
84°
63°
15
Hist. Avg.
84°
63°
16
Hist. Avg.
83°
63°
17
Hist. Avg.
83°
62°
18
Hist. Avg.
83°
62°
19
Hist. Avg.
83°
62°
20
Hist. Avg.
83°
62°
21
Hist. Avg.
83°
62°
22
Hist. Avg.
83°
62°
23
Hist. Avg.
82°
62°
24
Hist. Avg.
82°
61°
25
Hist. Avg.
82°
61°
26
Hist. Avg.
82°
61°
27
Hist. Avg.
82°
61°
28
Hist. Avg.
81°
60°
29
Hist. Avg.
81°
60°
30
Hist. Avg.
81°
60°
31
Hist. Avg.
81°
60°
1
Hist. Avg.
80°
59°
2
Hist. Avg.
80°
59°
3
Hist. Avg.
80°
59°
4
Hist. Avg.
80°
58°
5
Hist. Avg.
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Onalaska
Onalaska's August 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 58° and 68°. The average high for August is 83° 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 August weather will actually feel in Onalaska. See also: September | October | November.
