S
M
T
W
T
F
S
26
62°
46°
27
69°
48°
28
65°
39°
29
69°
41°
30
69°
39°
1
69°
36°
2
75°
39°
3
80°
43°
4
76°
54°
5
73°
49°
6
62°
41°
7
77°
36°
8
85°
45°
9
85°
51°
10
80°
51°
11
89°
44°
12
96°
49°
13
93°
52°
14
88°
51°
15
91°
51°
16
89°
59°
17
73°
53°
18
57°
42°
19
67°
42°
20
71°
39°
21
83°
41°
22
71°
48°
23
84°
44°
24
87°
60°
25
82°
56°
26
77°
59°
27
84°
61°
28
87°
59°
29
81°
56°
30
83°
57°
31
90°
60°
1
91°
59°
2
91°
63°
3
92°
62°
4
91°
60°
5
90°
61°
6
87°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Castle Valley
Castle Valley's May 2026 forecast shows daily high temperatures ranging from 77° to 92°, with overnight lows between 56° and 63°. The average high for May is 87° with an average low of 59°. 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 Valley. See also: June | July | August.
