S
M
T
W
T
F
S
26
89°
69°
27
89°
76°
28
93°
77°
29
87°
69°
30
79°
64°
1
67°
56°
2
75°
53°
3
80°
53°
4
83°
61°
5
89°
69°
6
86°
67°
7
71°
62°
8
79°
64°
9
91°
73°
10
90°
66°
11
84°
66°
12
86°
64°
13
88°
64°
14
90°
63°
15
94°
70°
16
92°
75°
17
90°
78°
18
95°
77°
19
88°
70°
20
83°
70°
21
83°
70°
22
81°
68°
23
84°
72°
24
87°
72°
25
86°
73°
26
85°
72°
27
86°
71°
28
88°
69°
29
88°
73°
30
89°
73°
31
84°
72°
1
84°
72°
2
85°
71°
3
85°
70°
4
86°
72°
5
85°
72°
6
86°
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 81° to 95°, with overnight lows between 68° and 78°. The average high for May is 87° with an average low of 72°. 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.
