S
M
T
W
T
F
S
26
82°
52°
27
81°
53°
28
81°
53°
29
80°
52°
30
82°
53°
31
82°
53°
1
81°
52°
2
82°
53°
3
82°
53°
4
81°
52°
5
82°
53°
6
82°
53°
7
81°
52°
8
79°
52°
9
81°
51°
10
81°
52°
11
80°
52°
12
80°
51°
13
79°
51°
14
80°
50°
15
81°
51°
16
79°
51°
17
75°
46°
18
76°
48°
19
77°
45°
20
78°
50°
21
81°
47°
22
78°
48°
23
79°
47°
24
81°
47°
25
81°
46°
26
80°
47°
27
79°
46°
28
74°
45°
29
79°
46°
30
79°
46°
31
80°
48°
1
80°
46°
2
79°
46°
3
76°
45°
4
78°
43°
5
72°
40°
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 72° to 82°, with overnight lows between 40° and 53°. The average high for August is 80° with an average low of 49°. 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.
