S
M
T
W
T
F
S
26
90°
74°
27
89°
74°
28
89°
74°
29
88°
74°
30
88°
74°
31
89°
74°
1
88°
74°
2
88°
73°
3
89°
74°
4
88°
75°
5
89°
76°
6
90°
75°
7
90°
74°
8
89°
73°
9
88°
74°
10
89°
76°
11
90°
74°
12
88°
74°
13
87°
75°
14
88°
75°
15
88°
74°
16
89°
75°
17
88°
75°
18
88°
76°
19
89°
76°
20
89°
75°
21
88°
75°
22
88°
74°
23
90°
77°
24
92°
75°
25
92°
75°
26
91°
76°
27
92°
76°
28
92°
75°
29
91°
76°
30
92°
76°
31
92°
75°
1
91°
74°
2
92°
76°
3
91°
76°
4
93°
76°
5
92°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Antonio
San Antonio's August 2026 forecast shows daily high temperatures ranging from 87° to 93°, with overnight lows between 73° and 77°. The average high for August is 90° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in San Antonio. See also: September | October | November.
