S
M
T
W
T
F
S
30
83°
69°
31
87°
71°
1
95°
77°
2
96°
78°
3
88°
72°
4
94°
70°
5
84°
70°
6
83°
64°
7
83°
64°
8
88°
65°
9
89°
64°
10
83°
60°
11
82°
59°
12
86°
60°
13
83°
57°
14
82°
58°
15
83°
56°
16
78°
51°
17
80°
57°
18
73°
56°
19
78°
56°
20
78°
55°
21
77°
56°
22
76°
54°
23
73°
53°
24
75°
51°
25
78°
53°
26
77°
48°
27
67°
44°
28
65°
41°
29
66°
44°
30
65°
42°
1
64°
43°
2
68°
50°
3
67°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Roselle
Roselle's September 2026 forecast shows daily high temperatures ranging from 64° to 94°, with overnight lows between 41° and 72°. The average high for September is 78° with an average low of 56°. 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 Roselle. See also: October | November | December.
