S
M
T
W
T
F
S
26
99°
78°
27
98°
78°
28
97°
77°
29
98°
76°
30
99°
77°
31
98°
76°
1
97°
75°
2
96°
76°
3
97°
76°
4
97°
77°
5
98°
77°
6
98°
76°
7
97°
76°
8
98°
75°
9
95°
76°
10
94°
75°
11
96°
75°
12
96°
74°
13
95°
75°
14
96°
72°
15
96°
72°
16
95°
72°
17
97°
73°
18
96°
72°
19
95°
65°
20
88°
65°
21
87°
64°
22
88°
65°
23
90°
65°
24
93°
68°
25
95°
71°
26
95°
70°
27
96°
70°
28
96°
71°
29
95°
71°
30
95°
70°
31
94°
68°
1
93°
63°
2
93°
61°
3
86°
62°
4
91°
69°
5
92°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Keystone Lake
Keystone Lake's August 2026 forecast shows daily high temperatures ranging from 86° to 99°, with overnight lows between 61° and 78°. The average high for August is 95° with an average low of 72°. 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 Lake. See also: September | October | November.
