S
M
T
W
T
F
S
30
80°
60°
31
79°
57°
1
80°
56°
2
79°
56°
3
78°
55°
4
78°
55°
5
79°
59°
6
78°
61°
7
83°
55°
8
78°
56°
9
80°
60°
10
82°
61°
11
81°
61°
12
83°
60°
13
82°
57°
14
76°
60°
15
82°
60°
16
82°
59°
17
81°
58°
18
82°
53°
19
75°
58°
20
79°
50°
21
81°
49°
22
73°
48°
23
73°
54°
24
79°
49°
25
78°
48°
26
Hist. Avg.
75°
51°
27
Hist. Avg.
74°
50°
28
Hist. Avg.
74°
50°
29
Hist. Avg.
74°
50°
30
Hist. Avg.
73°
49°
1
Hist. Avg.
73°
49°
2
Hist. Avg.
72°
48°
3
Hist. Avg.
72°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Roselle
Roselle's September 2026 forecast shows daily high temperatures ranging from 73° to 83°, with overnight lows between 48° and 61°. The average high for September is 79° 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.
