S
M
T
W
T
F
S
26
86°
70°
27
87°
70°
28
89°
68°
29
82°
67°
30
81°
63°
31
83°
58°
1
83°
63°
2
85°
67°
3
79°
64°
4
83°
65°
5
84°
64°
6
82°
64°
7
83°
66°
8
84°
66°
9
82°
67°
10
86°
65°
11
87°
67°
12
85°
64°
13
87°
69°
14
87°
68°
15
88°
68°
16
88°
71°
17
90°
63°
18
83°
68°
19
86°
64°
20
88°
66°
21
84°
68°
22
85°
64°
23
83°
60°
24
82°
54°
25
82°
56°
26
84°
58°
27
83°
67°
28
83°
66°
29
84°
67°
30
85°
68°
31
87°
67°
1
86°
65°
2
89°
64°
3
88°
63°
4
88°
64°
5
87°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Three Sisters Mountain
Three Sisters Mountain's August 2026 forecast shows daily high temperatures ranging from 83° to 89°, with overnight lows between 63° and 68°. The average high for August is 86° with an average low of 65°. 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 Three Sisters Mountain. See also: September | October | November.
