S
M
T
W
T
F
S
26
86°
68°
27
85°
68°
28
86°
67°
29
87°
68°
30
86°
67°
31
86°
67°
1
79°
64°
2
78°
61°
3
79°
63°
4
78°
66°
5
78°
66°
6
80°
65°
7
82°
64°
8
82°
65°
9
81°
66°
10
83°
66°
11
83°
65°
12
84°
65°
13
85°
66°
14
86°
64°
15
87°
65°
16
81°
64°
17
79°
63°
18
83°
65°
19
82°
58°
20
80°
56°
21
77°
56°
22
76°
55°
23
77°
57°
24
78°
56°
25
77°
58°
26
78°
61°
27
81°
60°
28
82°
58°
29
78°
57°
30
78°
56°
31
76°
55°
1
75°
58°
2
77°
58°
3
76°
55°
4
77°
55°
5
76°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Keystone
Keystone's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 55° and 68°. The average high for August is 81° 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 Keystone. See also: September | October | November.
