S
M
T
W
T
F
S
30
79°
62°
31
81°
65°
1
83°
60°
2
84°
59°
3
77°
60°
4
78°
61°
5
79°
66°
6
83°
66°
7
85°
65°
8
78°
65°
9
77°
64°
10
82°
64°
11
82°
61°
12
81°
64°
13
80°
60°
14
78°
57°
15
75°
58°
16
74°
56°
17
74°
56°
18
75°
57°
19
79°
60°
20
78°
62°
21
79°
59°
22
75°
54°
23
73°
59°
24
74°
60°
25
78°
53°
26
71°
57°
27
76°
58°
28
77°
58°
29
Hist. Avg.
75°
57°
30
Hist. Avg.
75°
56°
1
Hist. Avg.
74°
56°
2
Hist. Avg.
74°
56°
3
Hist. Avg.
74°
55°
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 71° to 85°, with overnight lows between 53° and 66°. The average high for September is 78° with an average low of 60°. 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.
