S
M
T
W
T
F
S
26
76°
61°
27
82°
55°
28
75°
61°
29
80°
55°
30
78°
55°
31
87°
52°
1
72°
54°
2
73°
52°
3
85°
57°
4
95°
57°
5
96°
57°
6
88°
55°
7
88°
58°
8
84°
57°
9
80°
54°
10
80°
55°
11
80°
55°
12
81°
56°
13
82°
56°
14
81°
55°
15
82°
53°
16
76°
50°
17
79°
54°
18
82°
52°
19
82°
51°
20
80°
51°
21
77°
53°
22
76°
51°
23
79°
55°
24
75°
49°
25
82°
52°
26
83°
55°
27
83°
55°
28
82°
56°
29
77°
52°
30
74°
48°
31
75°
51°
1
73°
52°
2
73°
48°
3
74°
48°
4
76°
50°
5
72°
48°
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 72° to 96°, with overnight lows between 48° and 58°. The average high for August is 80° 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.
