S
M
T
W
T
F
S
26
72°
46°
27
64°
46°
28
62°
42°
29
72°
47°
30
72°
49°
1
69°
48°
2
67°
47°
3
72°
48°
4
66°
46°
5
66°
45°
6
65°
44°
7
65°
45°
8
69°
46°
9
69°
44°
10
62°
45°
11
63°
42°
12
65°
41°
13
71°
45°
14
73°
48°
15
72°
48°
16
72°
45°
17
64°
41°
18
72°
45°
19
65°
42°
20
65°
46°
21
66°
46°
22
64°
42°
23
65°
45°
24
72°
47°
25
73°
47°
26
70°
43°
27
67°
44°
28
65°
42°
29
68°
43°
30
65°
44°
31
65°
43°
1
66°
43°
2
74°
46°
3
75°
47°
4
71°
51°
5
66°
45°
6
67°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Castle Rock
Castle Rock's May 2026 forecast shows daily high temperatures ranging from 62° to 75°, with overnight lows between 41° and 51°. The average high for May is 68° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Castle Rock. See also: June | July | August.
