S
M
T
W
T
F
S
30
73°
56°
31
75°
54°
1
77°
61°
2
75°
60°
3
80°
62°
4
76°
58°
5
72°
57°
6
74°
55°
7
77°
59°
8
73°
57°
9
70°
60°
10
70°
47°
11
68°
48°
12
72°
57°
13
73°
54°
14
68°
51°
15
69°
52°
16
69°
49°
17
68°
49°
18
68°
50°
19
66°
49°
20
63°
45°
21
60°
50°
22
61°
50°
23
67°
49°
24
69°
50°
25
69°
49°
26
68°
47°
27
64°
45°
28
67°
47°
29
68°
49°
30
70°
50°
1
70°
50°
2
68°
47°
3
67°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fallingbrook
Fallingbrook's September 2026 forecast shows daily high temperatures ranging from 60° to 77°, with overnight lows between 45° and 60°. The average high for September is 68° with an average low of 50°. 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 Fallingbrook. See also: October | November | December.
