S
M
T
W
T
F
S
26
73°
55°
27
74°
49°
28
74°
53°
29
73°
51°
30
72°
60°
1
70°
56°
2
72°
60°
3
76°
59°
4
68°
60°
5
71°
56°
6
70°
52°
7
63°
49°
8
66°
43°
9
67°
45°
10
67°
46°
11
68°
58°
12
66°
56°
13
64°
57°
14
66°
56°
15
66°
57°
16
69°
56°
17
66°
60°
18
64°
58°
19
64°
57°
20
69°
51°
21
67°
57°
22
65°
58°
23
67°
59°
24
69°
56°
25
66°
52°
26
61°
53°
27
66°
51°
28
67°
49°
29
68°
52°
30
67°
51°
31
68°
51°
1
65°
52°
2
65°
51°
3
64°
48°
4
64°
53°
5
63°
52°
6
64°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Castle Hill
Castle Hill's May 2026 forecast shows daily high temperatures ranging from 61° to 69°, with overnight lows between 48° and 59°. The average high for May is 66° 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 May weather will actually feel in Castle Hill. See also: June | July | August.
