S
M
T
W
T
F
S
26
63°
53°
27
63°
53°
28
64°
54°
29
64°
54°
30
63°
53°
31
63°
53°
1
68°
54°
2
68°
55°
3
65°
54°
4
64°
53°
5
63°
53°
6
63°
54°
7
64°
54°
8
64°
55°
9
65°
54°
10
68°
54°
11
65°
54°
12
69°
53°
13
68°
55°
14
70°
57°
15
69°
58°
16
70°
58°
17
71°
59°
18
71°
59°
19
72°
58°
20
72°
59°
21
71°
59°
22
72°
58°
23
72°
58°
24
71°
57°
25
72°
58°
26
72°
59°
27
71°
58°
28
71°
58°
29
70°
56°
30
70°
55°
31
69°
53°
1
69°
54°
2
68°
53°
3
67°
52°
4
66°
51°
5
66°
52°
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 63° to 72°, with overnight lows between 51° and 59°. The average high for August is 68° with an average low of 55°. 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.
