S
M
T
W
T
F
S
26
98°
75°
27
98°
74°
28
95°
71°
29
95°
73°
30
96°
74°
31
100°
75°
1
100°
76°
2
101°
74°
3
99°
72°
4
96°
70°
5
95°
69°
6
92°
69°
7
94°
70°
8
94°
71°
9
95°
72°
10
95°
72°
11
97°
73°
12
99°
74°
13
100°
75°
14
100°
73°
15
99°
71°
16
96°
71°
17
94°
70°
18
95°
71°
19
93°
72°
20
93°
70°
21
94°
70°
22
94°
72°
23
93°
71°
24
94°
72°
25
96°
73°
26
96°
72°
27
94°
72°
28
92°
71°
29
91°
71°
30
91°
70°
31
93°
71°
1
92°
70°
2
89°
69°
3
91°
70°
4
92°
69°
5
91°
70°
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 101°, with overnight lows between 69° and 76°. The average high for August is 95° with an average low of 72°. 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.
