S
M
T
W
T
F
S
26
63°
51°
27
66°
43°
28
74°
44°
29
75°
46°
30
78°
49°
1
74°
51°
2
59°
52°
3
64°
53°
4
66°
48°
5
60°
51°
6
71°
50°
7
80°
53°
8
73°
49°
9
76°
51°
10
80°
52°
11
89°
47°
12
77°
51°
13
70°
53°
14
84°
48°
15
84°
47°
16
73°
48°
17
76°
47°
18
82°
59°
19
88°
45°
20
85°
51°
21
92°
51°
22
81°
51°
23
70°
54°
24
70°
52°
25
69°
53°
26
75°
51°
27
78°
55°
28
76°
54°
29
76°
55°
30
80°
52°
31
81°
53°
1
83°
55°
2
82°
57°
3
86°
59°
4
86°
57°
5
84°
55°
6
81°
56°
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 69° to 86°, with overnight lows between 51° and 59°. The average high for May is 79° with an average low of 55°. 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.
