S
M
T
W
T
F
S
26
85°
58°
27
84°
58°
28
85°
55°
29
86°
55°
30
85°
52°
31
80°
51°
1
81°
55°
2
85°
55°
3
86°
54°
4
85°
53°
5
84°
50°
6
81°
51°
7
84°
58°
8
86°
58°
9
87°
53°
10
87°
51°
11
85°
48°
12
80°
49°
13
80°
49°
14
81°
48°
15
80°
49°
16
82°
55°
17
85°
58°
18
84°
59°
19
85°
57°
20
86°
58°
21
84°
56°
22
76°
53°
23
76°
56°
24
80°
55°
25
76°
49°
26
74°
51°
27
75°
48°
28
74°
48°
29
75°
46°
30
76°
47°
31
76°
49°
1
75°
55°
2
74°
56°
3
74°
54°
4
73°
52°
5
74°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Castle Rock
Castle Rock's August 2026 forecast shows daily high temperatures ranging from 73° to 87°, with overnight lows between 46° and 59°. The average high for August is 81° with an average low of 53°. 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 Castle Rock. See also: September | October | November.
