S
M
T
W
T
F
S
26
79°
60°
27
83°
50°
28
85°
51°
29
87°
57°
30
89°
58°
1
88°
59°
2
92°
64°
3
96°
74°
4
81°
62°
5
79°
54°
6
82°
59°
7
90°
64°
8
100°
68°
9
104°
68°
10
104°
67°
11
106°
69°
12
105°
71°
13
106°
70°
14
107°
71°
15
104°
68°
16
101°
67°
17
97°
61°
18
100°
66°
19
100°
66°
20
101°
65°
21
102°
67°
22
102°
67°
23
101°
68°
24
102°
67°
25
102°
67°
26
101°
66°
27
100°
67°
28
98°
68°
29
95°
61°
30
96°
60°
31
95°
63°
1
96°
63°
2
97°
66°
3
97°
66°
4
98°
67°
5
100°
70°
6
101°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Casa Grande
Casa Grande's May 2026 forecast shows daily high temperatures ranging from 79° to 107°, with overnight lows between 54° and 71°. The average high for May is 99° with an average low of 66°. 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 Casa Grande. See also: June | July | August.
