S
M
T
W
T
F
S
30
95°
60°
31
95°
60°
1
94°
59°
2
94°
59°
3
93°
55°
4
92°
55°
5
91°
54°
6
92°
55°
7
89°
53°
8
88°
58°
9
91°
59°
10
89°
56°
11
90°
54°
12
90°
54°
13
87°
55°
14
84°
53°
15
Hist. Avg.
86°
50°
16
Hist. Avg.
86°
50°
17
Hist. Avg.
85°
50°
18
Hist. Avg.
85°
49°
19
Hist. Avg.
84°
49°
20
Hist. Avg.
84°
48°
21
Hist. Avg.
84°
48°
22
Hist. Avg.
83°
48°
23
Hist. Avg.
83°
47°
24
Hist. Avg.
83°
47°
25
Hist. Avg.
82°
46°
26
Hist. Avg.
82°
46°
27
Hist. Avg.
82°
45°
28
Hist. Avg.
81°
45°
29
Hist. Avg.
81°
44°
30
Hist. Avg.
80°
44°
1
Hist. Avg.
80°
44°
2
Hist. Avg.
80°
43°
3
Hist. Avg.
79°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Francisco
San Francisco's September 2026 forecast shows daily high temperatures ranging from 84° to 95°, with overnight lows between 53° and 60°. The average high for September is 91° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in San Francisco. See also: October | November | December.
