S
M
T
W
T
F
S
30
91°
70°
31
93°
70°
1
96°
70°
2
98°
72°
3
97°
73°
4
97°
72°
5
100°
72°
6
97°
71°
7
82°
68°
8
88°
67°
9
88°
70°
10
87°
70°
11
88°
70°
12
87°
70°
13
91°
71°
14
90°
68°
15
89°
67°
16
84°
67°
17
86°
66°
18
86°
65°
19
83°
66°
20
85°
60°
21
86°
66°
22
85°
65°
23
85°
66°
24
84°
65°
25
84°
65°
26
85°
64°
27
85°
65°
28
84°
65°
29
83°
64°
30
83°
64°
1
82°
63°
2
81°
60°
3
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brookhaven
Brookhaven's September 2026 forecast shows daily high temperatures ranging from 75° to 91°, with overnight lows between 57° and 71°. The average high for September is 85° with an average low of 66°. 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.
