S
M
T
W
T
F
S
26
82°
65°
27
80°
64°
28
74°
62°
29
81°
60°
30
85°
65°
31
74°
65°
1
76°
62°
2
74°
62°
3
79°
58°
4
81°
62°
5
72°
55°
6
77°
54°
7
80°
61°
8
79°
61°
9
73°
61°
10
78°
62°
11
79°
63°
12
78°
63°
13
79°
61°
14
78°
62°
15
79°
62°
16
83°
60°
17
79°
56°
18
78°
59°
19
75°
61°
20
75°
63°
21
75°
60°
22
71°
59°
23
72°
55°
24
74°
58°
25
75°
57°
26
71°
55°
27
73°
56°
28
74°
58°
29
75°
57°
30
72°
57°
31
75°
55°
1
71°
59°
2
69°
58°
3
69°
59°
4
73°
59°
5
71°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sister Bay
Sister Bay's August 2026 forecast shows daily high temperatures ranging from 69° to 78°, with overnight lows between 55° and 63°. The average high for August is 73° with an average low of 58°. 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 Sister Bay. See also: September | October | November.
