S
M
T
W
T
F
S
26
64°
46°
27
63°
46°
28
61°
52°
29
59°
45°
30
59°
45°
31
63°
50°
1
82°
52°
2
87°
55°
3
83°
51°
4
80°
53°
5
81°
56°
6
77°
49°
7
75°
50°
8
74°
48°
9
76°
48°
10
73°
48°
11
70°
48°
12
71°
47°
13
69°
46°
14
70°
38°
15
72°
42°
16
72°
42°
17
69°
41°
18
67°
40°
19
68°
40°
20
67°
39°
21
67°
39°
22
66°
37°
23
67°
38°
24
70°
41°
25
71°
39°
26
68°
38°
27
70°
40°
28
71°
39°
29
70°
40°
30
71°
41°
31
71°
40°
1
70°
39°
2
70°
39°
3
69°
38°
4
65°
38°
5
65°
39°
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 65° to 87°, with overnight lows between 37° and 56°. The average high for August is 72° 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 Keystone. See also: September | October | November.
