S
M
T
W
T
F
S
30
89°
71°
31
86°
70°
1
87°
69°
2
86°
66°
3
86°
65°
4
85°
65°
5
85°
66°
6
88°
66°
7
90°
68°
8
90°
70°
9
89°
69°
10
89°
69°
11
88°
68°
12
89°
69°
13
89°
68°
14
88°
67°
15
89°
68°
16
88°
68°
17
89°
66°
18
86°
66°
19
87°
65°
20
87°
65°
21
86°
66°
22
87°
63°
23
85°
66°
24
Hist. Avg.
85°
60°
25
Hist. Avg.
84°
60°
26
Hist. Avg.
84°
59°
27
Hist. Avg.
84°
59°
28
Hist. Avg.
84°
58°
29
Hist. Avg.
83°
58°
30
Hist. Avg.
83°
58°
1
Hist. Avg.
83°
57°
2
Hist. Avg.
82°
57°
3
Hist. Avg.
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Brookhaven
Brookhaven's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 63° and 71°. The average high for September is 88° with an average low of 67°. 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 Brookhaven. See also: October | November | December.
