S
M
T
W
T
F
S
30
80°
59°
31
80°
68°
1
82°
65°
2
74°
68°
3
84°
66°
4
84°
60°
5
80°
59°
6
72°
58°
7
75°
58°
8
74°
54°
9
72°
56°
10
75°
56°
11
75°
56°
12
76°
57°
13
75°
56°
14
74°
54°
15
70°
54°
16
70°
58°
17
72°
51°
18
69°
49°
19
68°
49°
20
69°
52°
21
73°
56°
22
76°
57°
23
77°
56°
24
76°
54°
25
74°
52°
26
74°
53°
27
75°
54°
28
74°
54°
29
75°
51°
30
67°
46°
1
64°
45°
2
67°
49°
3
72°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mahwah Township
Mahwah Township's September 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 45° and 68°. The average high for September is 74° with an average low of 55°. 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 Mahwah Township. See also: October | November | December.
