S
M
T
W
T
F
S
26
80°
60°
27
74°
60°
28
74°
59°
29
75°
61°
30
82°
61°
31
81°
60°
1
74°
60°
2
74°
58°
3
74°
50°
4
72°
52°
5
75°
54°
6
77°
53°
7
79°
54°
8
78°
51°
9
77°
55°
10
80°
58°
11
74°
57°
12
79°
53°
13
74°
51°
14
75°
53°
15
77°
55°
16
78°
54°
17
75°
51°
18
74°
53°
19
75°
57°
20
76°
58°
21
81°
59°
22
81°
59°
23
80°
58°
24
81°
57°
25
82°
55°
26
74°
56°
27
77°
58°
28
78°
56°
29
79°
51°
30
72°
47°
31
71°
49°
1
70°
48°
2
70°
48°
3
71°
49°
4
71°
46°
5
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Ontonagon
Ontonagon's August 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 46° and 61°. The average high for August is 76° with an average low of 55°. 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 Ontonagon. See also: September | October | November.
