S
M
T
W
T
F
S
26
82°
48°
27
81°
51°
28
83°
52°
29
81°
51°
30
77°
59°
1
65°
48°
2
67°
47°
3
78°
42°
4
81°
48°
5
80°
59°
6
77°
44°
7
78°
46°
8
87°
49°
9
91°
51°
10
89°
59°
11
88°
53°
12
96°
57°
13
93°
61°
14
93°
67°
15
92°
63°
16
91°
58°
17
89°
54°
18
89°
57°
19
89°
58°
20
91°
55°
21
88°
57°
22
88°
59°
23
88°
52°
24
88°
53°
25
89°
55°
26
90°
54°
27
92°
54°
28
94°
57°
29
93°
58°
30
95°
58°
31
93°
50°
1
94°
54°
2
94°
54°
3
93°
51°
4
86°
54°
5
89°
54°
6
95°
55°
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 86° to 95°, with overnight lows between 50° and 59°. The average high for May is 91° 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 San Antonio. See also: June | July | August.
