S
M
T
W
T
F
S
26
89°
49°
27
86°
48°
28
82°
45°
29
81°
45°
30
80°
41°
31
82°
45°
1
88°
48°
2
88°
47°
3
85°
42°
4
83°
40°
5
89°
45°
6
90°
44°
7
83°
41°
8
84°
42°
9
82°
48°
10
89°
49°
11
91°
49°
12
91°
48°
13
90°
47°
14
90°
44°
15
90°
43°
16
89°
40°
17
88°
42°
18
85°
42°
19
80°
38°
20
80°
38°
21
81°
40°
22
79°
37°
23
78°
41°
24
81°
43°
25
85°
46°
26
86°
45°
27
86°
43°
28
85°
45°
29
85°
44°
30
84°
44°
31
84°
43°
1
82°
40°
2
80°
41°
3
81°
40°
4
80°
40°
5
79°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sisters
Sisters's August 2026 forecast shows daily high temperatures ranging from 78° to 91°, with overnight lows between 37° and 49°. The average high for August is 85° with an average low of 43°. 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 Sisters. See also: September | October | November.
