S
M
T
W
T
F
S
26
90°
73°
27
84°
73°
28
86°
75°
29
86°
76°
30
82°
74°
1
86°
74°
2
86°
73°
3
86°
73°
4
89°
73°
5
86°
75°
6
86°
75°
7
89°
74°
8
88°
74°
9
86°
74°
10
86°
75°
11
87°
74°
12
88°
73°
13
87°
73°
14
86°
72°
15
87°
73°
16
88°
73°
17
88°
73°
18
87°
74°
19
86°
75°
20
87°
74°
21
88°
74°
22
87°
74°
23
86°
73°
24
86°
75°
25
87°
74°
26
87°
75°
27
88°
75°
28
88°
74°
29
89°
75°
30
87°
75°
31
88°
74°
1
87°
75°
2
87°
75°
3
88°
73°
4
87°
74°
5
87°
74°
6
88°
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 86° to 89°, with overnight lows between 72° and 75°. The average high for May is 87° with an average low of 74°. 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.
