S
M
T
W
T
F
S
26
79°
60°
27
80°
61°
28
80°
60°
29
79°
61°
30
81°
62°
31
81°
61°
1
80°
60°
2
76°
57°
3
75°
54°
4
74°
56°
5
73°
54°
6
74°
54°
7
75°
58°
8
77°
59°
9
80°
60°
10
80°
60°
11
79°
59°
12
77°
58°
13
80°
59°
14
80°
58°
15
79°
60°
16
75°
60°
17
74°
59°
18
81°
61°
19
80°
59°
20
76°
53°
21
77°
51°
22
73°
51°
23
73°
52°
24
74°
53°
25
73°
51°
26
73°
57°
27
74°
52°
28
73°
51°
29
72°
51°
30
72°
49°
31
70°
49°
1
70°
50°
2
71°
50°
3
69°
52°
4
69°
50°
5
72°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Big Boulder
Big Boulder's August 2026 forecast shows daily high temperatures ranging from 69° to 81°, with overnight lows between 49° and 62°. The average high for August is 76° with an average low of 56°. 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 Big Boulder. See also: September | October | November.
