S
M
T
W
T
F
S
26
63°
50°
27
68°
46°
28
75°
45°
29
79°
46°
30
79°
46°
1
73°
48°
2
64°
52°
3
67°
51°
4
64°
52°
5
70°
53°
6
74°
52°
7
77°
49°
8
80°
49°
9
83°
51°
10
84°
50°
11
89°
51°
12
78°
51°
13
79°
49°
14
78°
51°
15
85°
59°
16
75°
51°
17
76°
52°
18
75°
51°
19
76°
52°
20
77°
52°
21
75°
50°
22
74°
51°
23
76°
52°
24
77°
52°
25
77°
51°
26
76°
50°
27
70°
51°
28
70°
50°
29
71°
51°
30
71°
52°
31
72°
53°
1
74°
53°
2
77°
52°
3
75°
52°
4
72°
51°
5
72°
51°
6
71°
50°
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 64° to 89°, with overnight lows between 49° and 59°. The average high for May is 75° with an average low of 51°. 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.
