S
M
T
W
T
F
S
26
100°
69°
27
90°
72°
28
93°
68°
29
90°
65°
30
94°
64°
31
89°
61°
1
89°
64°
2
97°
66°
3
98°
55°
4
80°
53°
5
86°
55°
6
92°
63°
7
94°
61°
8
90°
60°
9
89°
61°
10
91°
59°
11
88°
59°
12
85°
60°
13
83°
58°
14
84°
55°
15
85°
57°
16
86°
58°
17
86°
58°
18
85°
57°
19
85°
55°
20
84°
55°
21
85°
56°
22
84°
54°
23
84°
55°
24
85°
58°
25
86°
55°
26
83°
55°
27
85°
57°
28
86°
56°
29
85°
57°
30
86°
58°
31
86°
57°
1
85°
56°
2
85°
57°
3
84°
56°
4
82°
55°
5
82°
56°
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 80° to 98°, with overnight lows between 53° and 66°. The average high for August is 86° with an average low of 57°. 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.
