S
M
T
W
T
F
S
30
92°
65°
31
90°
67°
1
91°
69°
2
94°
69°
3
93°
68°
4
90°
69°
5
91°
70°
6
94°
69°
7
92°
70°
8
92°
71°
9
91°
71°
10
93°
70°
11
93°
72°
12
92°
72°
13
95°
71°
14
94°
71°
15
93°
70°
16
92°
71°
17
93°
70°
18
92°
70°
19
92°
69°
20
91°
69°
21
87°
68°
22
85°
60°
23
90°
66°
24
90°
69°
25
Hist. Avg.
86°
63°
26
Hist. Avg.
86°
63°
27
Hist. Avg.
85°
63°
28
Hist. Avg.
85°
63°
29
Hist. Avg.
85°
62°
30
Hist. Avg.
85°
62°
1
Hist. Avg.
84°
62°
2
Hist. Avg.
84°
62°
3
Hist. Avg.
84°
61°
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 85° to 95°, with overnight lows between 60° and 72°. The average high for September is 92° with an average low of 69°. 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.
