S
M
T
W
T
F
S
26
90°
73°
27
91°
74°
28
87°
74°
29
87°
73°
30
88°
73°
1
90°
73°
2
91°
73°
3
91°
72°
4
92°
74°
5
92°
74°
6
93°
74°
7
91°
73°
8
90°
72°
9
90°
72°
10
90°
72°
11
91°
72°
12
90°
73°
13
89°
74°
14
91°
73°
15
91°
74°
16
90°
74°
17
87°
73°
18
87°
72°
19
88°
71°
20
87°
74°
21
88°
73°
22
87°
74°
23
85°
71°
24
85°
72°
25
84°
73°
26
85°
73°
27
86°
74°
28
86°
73°
29
85°
72°
30
85°
72°
31
86°
74°
1
85°
74°
2
85°
73°
3
86°
74°
4
86°
74°
5
87°
73°
6
86°
72°
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 84° to 91°, with overnight lows between 71° and 74°. The average high for May is 87° with an average low of 73°. 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.
