S
M
T
W
T
F
S
26
89°
69°
27
89°
76°
28
94°
75°
29
82°
68°
30
81°
64°
1
74°
53°
2
71°
54°
3
74°
54°
4
82°
60°
5
87°
68°
6
86°
69°
7
87°
65°
8
85°
62°
9
84°
66°
10
84°
68°
11
85°
66°
12
86°
68°
13
82°
64°
14
80°
61°
15
79°
61°
16
80°
62°
17
81°
62°
18
81°
63°
19
82°
63°
20
82°
64°
21
83°
67°
22
82°
68°
23
82°
68°
24
82°
69°
25
82°
68°
26
83°
69°
27
84°
66°
28
84°
66°
29
85°
67°
30
84°
66°
31
84°
67°
1
85°
67°
2
85°
69°
3
86°
70°
4
87°
73°
5
88°
72°
6
89°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Antonio
San Antonio's May 2026 forecast shows daily high temperatures ranging from 71° to 94°, with overnight lows between 53° and 75°. The average high for May is 83° 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 Antonio. See also: June | July | August.
