S
M
T
W
T
F
S
26
65°
57°
27
65°
56°
28
71°
57°
29
67°
57°
30
67°
56°
31
72°
55°
1
74°
56°
2
75°
56°
3
70°
56°
4
69°
56°
5
68°
58°
6
67°
56°
7
64°
56°
8
62°
56°
9
68°
55°
10
68°
58°
11
67°
59°
12
69°
61°
13
70°
59°
14
67°
58°
15
68°
57°
16
65°
59°
17
66°
58°
18
69°
59°
19
69°
58°
20
68°
58°
21
70°
59°
22
69°
56°
23
67°
58°
24
65°
56°
25
66°
56°
26
69°
58°
27
70°
59°
28
70°
59°
29
68°
58°
30
71°
58°
31
71°
57°
1
73°
59°
2
72°
59°
3
67°
58°
4
68°
57°
5
70°
58°
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 65° to 73°, with overnight lows between 55° and 61°. The average high for August is 69° with an average low of 58°. 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.
