S
M
T
W
T
F
S
30
83°
57°
31
82°
61°
1
82°
58°
2
83°
60°
3
81°
60°
4
81°
59°
5
80°
59°
6
79°
58°
7
78°
58°
8
79°
57°
9
79°
57°
10
78°
56°
11
79°
57°
12
80°
57°
13
80°
58°
14
79°
57°
15
78°
57°
16
78°
56°
17
77°
56°
18
75°
54°
19
74°
46°
20
69°
51°
21
70°
54°
22
71°
46°
23
69°
46°
24
68°
48°
25
70°
52°
26
73°
51°
27
68°
47°
28
68°
46°
29
66°
45°
30
67°
45°
1
67°
52°
2
68°
50°
3
69°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mahopac
Mahopac's September 2026 forecast shows daily high temperatures ranging from 66° to 83°, with overnight lows between 43° and 61°. The average high for September is 75° with an average low of 54°. 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 Mahopac. See also: October | November | December.
