S
M
T
W
T
F
S
26
89°
74°
27
89°
74°
28
90°
75°
29
90°
73°
30
91°
73°
31
92°
74°
1
92°
73°
2
90°
73°
3
93°
74°
4
94°
76°
5
94°
76°
6
93°
75°
7
94°
74°
8
94°
74°
9
93°
75°
10
94°
74°
11
94°
74°
12
93°
73°
13
91°
73°
14
91°
75°
15
94°
75°
16
94°
74°
17
93°
76°
18
94°
75°
19
93°
75°
20
94°
72°
21
91°
74°
22
92°
75°
23
94°
75°
24
94°
74°
25
93°
74°
26
91°
73°
27
94°
75°
28
94°
75°
29
91°
74°
30
93°
74°
31
91°
73°
1
91°
74°
2
94°
74°
3
92°
71°
4
93°
73°
5
94°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Francisco
San Francisco's August 2026 forecast shows daily high temperatures ranging from 89° to 94°, with overnight lows between 71° and 76°. The average high for August is 93° with an average low of 74°. 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 Francisco. See also: September | October | November.
