S
M
T
W
T
F
S
26
86°
61°
27
88°
60°
28
87°
61°
29
86°
60°
30
87°
60°
31
88°
61°
1
87°
61°
2
86°
60°
3
87°
60°
4
86°
61°
5
88°
60°
6
87°
58°
7
76°
57°
8
81°
58°
9
86°
59°
10
86°
58°
11
85°
59°
12
86°
58°
13
84°
57°
14
81°
57°
15
85°
58°
16
85°
57°
17
85°
56°
18
86°
56°
19
86°
55°
20
85°
53°
21
84°
46°
22
75°
47°
23
76°
50°
24
82°
50°
25
74°
49°
26
73°
53°
27
75°
52°
28
82°
54°
29
83°
53°
30
84°
53°
31
83°
52°
1
83°
47°
2
73°
46°
3
70°
49°
4
72°
50°
5
81°
41°
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 70° to 88°, with overnight lows between 41° and 61°. The average high for August is 83° with an average low of 55°. 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.
