S
M
T
W
T
F
S
30
84°
53°
31
80°
52°
1
78°
55°
2
77°
53°
3
79°
54°
4
78°
52°
5
76°
52°
6
76°
56°
7
76°
53°
8
77°
52°
9
78°
51°
10
76°
51°
11
75°
50°
12
74°
50°
13
76°
52°
14
75°
52°
15
78°
55°
16
81°
54°
17
82°
55°
18
81°
52°
19
80°
53°
20
Hist. Avg.
74°
55°
21
Hist. Avg.
74°
55°
22
Hist. Avg.
73°
55°
23
Hist. Avg.
73°
54°
24
Hist. Avg.
72°
54°
25
Hist. Avg.
72°
53°
26
Hist. Avg.
72°
53°
27
Hist. Avg.
71°
52°
28
Hist. Avg.
71°
52°
29
Hist. Avg.
70°
52°
30
Hist. Avg.
70°
51°
1
Hist. Avg.
69°
51°
2
Hist. Avg.
69°
50°
3
Hist. Avg.
68°
50°
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 74° to 84°, with overnight lows between 50° and 56°. The average high for September is 78° with an average low of 53°. 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.
