S
M
T
W
T
F
S
30
90°
70°
31
89°
66°
1
88°
65°
2
83°
63°
3
84°
64°
4
86°
67°
5
87°
65°
6
84°
64°
7
81°
62°
8
82°
67°
9
83°
62°
10
82°
62°
11
82°
63°
12
83°
63°
13
82°
62°
14
80°
61°
15
81°
62°
16
80°
61°
17
83°
62°
18
82°
61°
19
81°
64°
20
81°
64°
21
Hist. Avg.
81°
61°
22
Hist. Avg.
81°
61°
23
Hist. Avg.
80°
60°
24
Hist. Avg.
80°
60°
25
Hist. Avg.
80°
60°
26
Hist. Avg.
79°
59°
27
Hist. Avg.
79°
59°
28
Hist. Avg.
79°
58°
29
Hist. Avg.
78°
58°
30
Hist. Avg.
78°
57°
1
Hist. Avg.
78°
57°
2
Hist. Avg.
78°
56°
3
Hist. Avg.
77°
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 80° to 90°, with overnight lows between 61° and 70°. The average high for September is 83° with an average low of 64°. 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.
