S
M
T
W
T
F
S
26
91°
70°
27
91°
72°
28
93°
72°
29
91°
73°
30
95°
73°
31
93°
72°
1
98°
72°
2
99°
73°
3
99°
70°
4
94°
78°
5
99°
79°
6
99°
77°
7
97°
76°
8
96°
75°
9
95°
74°
10
97°
75°
11
98°
74°
12
96°
76°
13
98°
74°
14
96°
75°
15
97°
74°
16
98°
75°
17
97°
72°
18
94°
75°
19
96°
74°
20
97°
75°
21
97°
75°
22
96°
74°
23
96°
75°
24
95°
75°
25
96°
74°
26
96°
75°
27
96°
75°
28
95°
74°
29
95°
74°
30
96°
75°
31
96°
75°
1
95°
74°
2
94°
74°
3
95°
73°
4
95°
74°
5
96°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Antonio Northwest
San Antonio Northwest's August 2026 forecast shows daily high temperatures ranging from 94° to 99°, with overnight lows between 72° and 79°. The average high for August is 96° 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 Northwest. See also: September | October | November.
