S
M
T
W
T
F
S
26
98°
78°
27
101°
78°
28
97°
78°
29
95°
78°
30
98°
76°
1
96°
77°
2
N/A
3
99°
74°
4
97°
74°
5
99°
75°
6
97°
75°
7
101°
76°
8
100°
75°
9
96°
79°
10
97°
79°
11
98°
80°
12
96°
80°
13
98°
79°
14
97°
80°
15
92°
77°
16
93°
76°
17
94°
76°
18
91°
77°
19
91°
76°
20
93°
77°
21
91°
77°
22
91°
76°
23
92°
77°
24
92°
77°
25
91°
76°
26
91°
77°
27
92°
77°
28
90°
76°
29
90°
77°
30
89°
76°
31
88°
77°
1
89°
77°
2
88°
76°
3
88°
77°
4
89°
77°
5
90°
76°
6
88°
77°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in San Antonio
San Antonio's May 2026 forecast shows daily high temperatures ranging from 88° to 101°, with overnight lows between 74° and 80°. The average high for May is 93° with an average low of 77°. 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.
