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°
73°
8
89°
66°
9
91°
70°
10
91°
69°
11
88°
71°
12
86°
71°
13
87°
69°
14
89°
71°
15
88°
69°
16
89°
67°
17
86°
64°
18
84°
66°
19
82°
64°
20
83°
61°
21
79°
60°
22
85°
64°
23
84°
64°
24
84°
63°
25
83°
63°
26
84°
64°
27
84°
64°
28
83°
63°
29
83°
63°
30
82°
62°
1
82°
62°
2
81°
59°
3
76°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lilburn
Lilburn's September 2026 forecast shows daily high temperatures ranging from 76° to 91°, with overnight lows between 56° and 71°. The average high for September is 85° with an average low of 65°. 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 Lilburn. See also: October | November | December.
