S
M
T
W
T
F
S
26
88°
74°
27
92°
70°
28
89°
69°
29
90°
70°
30
89°
63°
1
83°
61°
2
79°
66°
3
82°
67°
4
83°
68°
5
84°
62°
6
83°
66°
7
86°
65°
8
78°
63°
9
78°
62°
10
79°
67°
11
82°
68°
12
85°
68°
13
84°
67°
14
81°
67°
15
81°
65°
16
82°
65°
17
80°
66°
18
82°
70°
19
85°
70°
20
80°
65°
21
81°
64°
22
82°
67°
23
83°
71°
24
88°
71°
25
88°
70°
26
86°
69°
27
83°
69°
28
84°
66°
29
85°
70°
30
88°
70°
31
85°
71°
1
86°
70°
2
86°
71°
3
85°
71°
4
87°
70°
5
91°
69°
6
93°
67°
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 78° to 93°, with overnight lows between 61° and 74°. The average high for May is 84° with an average low of 68°. 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.
