S
M
T
W
T
F
S
30
79°
67°
31
78°
69°
1
82°
67°
2
71°
65°
3
84°
67°
4
84°
71°
5
79°
68°
6
76°
64°
7
78°
61°
8
80°
62°
9
82°
68°
10
88°
72°
11
81°
67°
12
78°
69°
13
80°
70°
14
82°
66°
15
79°
72°
16
85°
67°
17
80°
66°
18
75°
62°
19
76°
63°
20
75°
64°
21
76°
60°
22
70°
62°
23
72°
60°
24
71°
63°
25
68°
55°
26
68°
56°
27
72°
63°
28
76°
59°
29
69°
55°
30
71°
61°
1
71°
59°
2
67°
55°
3
70°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Flatbush
Flatbush's September 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 55° and 72°. The average high for September is 75° 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 Flatbush. See also: October | November | December.
