S
M
T
W
T
F
S
30
90°
71°
31
88°
67°
1
86°
61°
2
82°
60°
3
82°
61°
4
83°
62°
5
90°
61°
6
75°
64°
7
88°
70°
8
97°
74°
9
105°
77°
10
98°
79°
11
92°
73°
12
89°
68°
13
86°
67°
14
85°
64°
15
82°
63°
16
80°
62°
17
80°
62°
18
80°
59°
19
84°
59°
20
84°
62°
21
79°
63°
22
82°
62°
23
90°
62°
24
N/A
25
88°
64°
26
94°
64°
27
88°
69°
28
82°
64°
29
84°
61°
30
86°
62°
1
90°
60°
2
101°
71°
3
99°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Montclair
Montclair's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Montclair. See also: October | November | December.
