S
M
T
W
T
F
S
26
80°
62°
27
82°
52°
28
90°
54°
29
89°
56°
30
93°
58°
1
89°
64°
2
94°
58°
3
96°
74°
4
81°
67°
5
80°
62°
6
84°
55°
7
96°
63°
8
102°
66°
9
103°
70°
10
104°
71°
11
110°
74°
12
103°
74°
13
98°
70°
14
100°
67°
15
99°
68°
16
98°
68°
17
97°
69°
18
92°
67°
19
93°
68°
20
95°
63°
21
89°
59°
22
88°
59°
23
89°
60°
24
90°
61°
25
95°
63°
26
99°
68°
27
96°
65°
28
93°
63°
29
92°
61°
30
95°
70°
31
97°
70°
1
93°
68°
2
94°
70°
3
98°
71°
4
96°
67°
5
94°
63°
6
93°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Tan Valley
San Tan Valley's May 2026 forecast shows daily high temperatures ranging from 88° to 110°, with overnight lows between 59° and 74°. The average high for May is 96° 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 San Tan Valley. See also: June | July | August.
