S
M
T
W
T
F
S
26
63°
43°
27
67°
45°
28
69°
46°
29
68°
42°
30
65°
47°
1
70°
46°
2
72°
47°
3
73°
48°
4
74°
50°
5
75°
50°
6
74°
49°
7
66°
49°
8
74°
48°
9
74°
49°
10
66°
48°
11
72°
49°
12
70°
50°
13
72°
50°
14
76°
51°
15
76°
51°
16
77°
53°
17
77°
52°
18
76°
49°
19
72°
51°
20
75°
52°
21
76°
52°
22
70°
46°
23
70°
50°
24
73°
53°
25
79°
53°
26
78°
45°
27
72°
50°
28
76°
54°
29
83°
55°
30
83°
54°
31
78°
53°
1
76°
54°
2
75°
51°
3
76°
52°
4
76°
53°
5
78°
54°
6
83°
51°
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 63° to 83°, with overnight lows between 42° and 55°. The average high for May is 74° with an average low of 50°. 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.
