S
M
T
W
T
F
S
26
90°
48°
27
88°
59°
28
88°
54°
29
86°
54°
30
86°
54°
31
88°
45°
1
90°
46°
2
95°
43°
3
91°
45°
4
88°
48°
5
88°
39°
6
88°
37°
7
90°
36°
8
90°
39°
9
84°
43°
10
72°
49°
11
78°
49°
12
77°
49°
13
71°
46°
14
69°
45°
15
69°
44°
16
70°
45°
17
71°
44°
18
74°
45°
19
74°
43°
20
72°
43°
21
73°
44°
22
75°
45°
23
71°
38°
24
72°
41°
25
72°
39°
26
71°
41°
27
69°
40°
28
67°
37°
29
69°
40°
30
67°
37°
31
68°
39°
1
67°
36°
2
67°
37°
3
68°
38°
4
64°
34°
5
65°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grand Lake
Grand Lake's August 2026 forecast shows daily high temperatures ranging from 64° to 78°, with overnight lows between 34° and 49°. The average high for August is 70° with an average low of 42°. 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 Grand Lake. See also: September | October | November.
