S
M
T
W
T
F
S
26
82°
62°
27
80°
58°
28
78°
57°
29
80°
60°
30
82°
61°
31
79°
59°
1
85°
63°
2
85°
59°
3
80°
58°
4
79°
57°
5
80°
58°
6
79°
59°
7
79°
58°
8
78°
57°
9
81°
62°
10
85°
61°
11
79°
62°
12
84°
63°
13
84°
63°
14
82°
62°
15
84°
62°
16
85°
56°
17
78°
57°
18
79°
61°
19
78°
57°
20
77°
54°
21
76°
55°
22
78°
55°
23
83°
58°
24
84°
61°
25
85°
60°
26
84°
54°
27
77°
53°
28
76°
53°
29
76°
54°
30
81°
58°
31
82°
59°
1
82°
59°
2
81°
56°
3
76°
56°
4
81°
59°
5
78°
57°
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 76° to 85°, with overnight lows between 53° and 63°. The average high for August is 81° 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 Keystone. See also: September | October | November.
