S
M
T
W
T
F
S
30
95°
63°
31
94°
65°
1
93°
66°
2
95°
67°
3
93°
66°
4
94°
66°
5
93°
65°
6
86°
65°
7
86°
63°
8
88°
61°
9
88°
59°
10
87°
58°
11
85°
58°
12
86°
59°
13
85°
57°
14
84°
58°
15
84°
57°
16
85°
58°
17
86°
57°
18
85°
56°
19
83°
57°
20
84°
59°
21
86°
62°
22
87°
62°
23
84°
62°
24
81°
58°
25
Hist. Avg.
86°
59°
26
Hist. Avg.
86°
58°
27
Hist. Avg.
85°
58°
28
Hist. Avg.
85°
58°
29
Hist. Avg.
85°
58°
30
Hist. Avg.
84°
58°
1
Hist. Avg.
84°
57°
2
Hist. Avg.
84°
57°
3
Hist. Avg.
84°
57°
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 81° to 95°, with overnight lows between 56° and 67°. The average high for September is 88° with an average low of 61°. 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.
