S
M
T
W
T
F
S
26
71°
44°
27
66°
36°
28
69°
39°
29
69°
31°
30
57°
32°
1
36°
32°
2
59°
29°
3
70°
35°
4
72°
47°
5
63°
39°
6
59°
29°
7
69°
27°
8
75°
41°
9
80°
37°
10
63°
39°
11
79°
37°
12
84°
46°
13
82°
43°
14
81°
53°
15
81°
52°
16
83°
48°
17
76°
52°
18
75°
47°
19
66°
34°
20
62°
44°
21
75°
45°
22
78°
37°
23
69°
45°
24
77°
46°
25
74°
48°
26
62°
43°
27
73°
46°
28
75°
49°
29
74°
48°
30
77°
47°
31
73°
49°
1
68°
46°
2
70°
48°
3
68°
49°
4
73°
48°
5
91°
56°
6
76°
49°
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 62° to 91°, with overnight lows between 43° and 56°. The average high for May is 73° with an average low of 48°. 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.
