S
M
T
W
T
F
S
30
78°
67°
31
83°
69°
1
84°
63°
2
82°
62°
3
77°
61°
4
78°
63°
5
77°
69°
6
82°
68°
7
84°
65°
8
77°
67°
9
76°
68°
10
79°
67°
11
79°
66°
12
78°
66°
13
77°
65°
14
74°
60°
15
74°
59°
16
73°
59°
17
73°
60°
18
74°
64°
19
76°
64°
20
76°
65°
21
78°
61°
22
74°
57°
23
72°
62°
24
71°
64°
25
76°
58°
26
76°
55°
27
Hist. Avg.
72°
58°
28
Hist. Avg.
72°
58°
29
Hist. Avg.
71°
58°
30
Hist. Avg.
71°
57°
1
Hist. Avg.
70°
57°
2
Hist. Avg.
70°
56°
3
Hist. Avg.
69°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Downtown Brooklyn
Downtown Brooklyn's September 2026 forecast shows daily high temperatures ranging from 71° to 84°, with overnight lows between 55° and 69°. The average high for September is 77° 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 Downtown Brooklyn. See also: October | November | December.
