S
M
T
W
T
F
S
30
74°
72°
31
72°
69°
1
71°
66°
2
70°
64°
3
70°
63°
4
77°
61°
5
74°
62°
6
89°
71°
7
76°
70°
8
80°
70°
9
80°
72°
10
76°
73°
11
74°
72°
12
71°
69°
13
72°
68°
14
80°
65°
15
80°
66°
16
78°
63°
17
78°
65°
18
77°
63°
19
76°
65°
20
75°
66°
21
73°
65°
22
74°
64°
23
76°
64°
24
78°
62°
25
78°
63°
26
80°
65°
27
79°
63°
28
76°
58°
29
75°
61°
30
73°
62°
1
72°
61°
2
72°
60°
3
73°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rancho Santa Fe
Rancho Santa Fe's September 2026 forecast shows daily high temperatures ranging from 72° to 80°, with overnight lows between 58° and 66°. The average high for September is 76° with an average low of 63°. 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 Rancho Santa Fe. See also: October | November | December.
