S
M
T
W
T
F
S
30
89°
70°
31
89°
70°
1
88°
69°
2
89°
70°
3
88°
69°
4
86°
66°
5
84°
65°
6
87°
64°
7
88°
68°
8
89°
69°
9
88°
69°
10
88°
68°
11
87°
69°
12
88°
68°
13
86°
68°
14
85°
65°
15
88°
66°
16
88°
65°
17
87°
66°
18
85°
61°
19
84°
57°
20
78°
58°
21
78°
57°
22
79°
58°
23
80°
61°
24
83°
63°
25
83°
58°
26
77°
56°
27
77°
59°
28
79°
59°
29
79°
61°
30
81°
58°
1
81°
60°
2
80°
60°
3
81°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lawrenceville
Lawrenceville's September 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 56° and 70°. The average high for September is 84° 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 Lawrenceville. See also: October | November | December.
