S
M
T
W
T
F
S
30
82°
62°
31
80°
56°
1
78°
55°
2
74°
57°
3
74°
56°
4
75°
56°
5
74°
57°
6
73°
55°
7
73°
55°
8
74°
57°
9
73°
56°
10
71°
55°
11
73°
55°
12
74°
57°
13
72°
56°
14
73°
55°
15
71°
54°
16
72°
53°
17
71°
52°
18
71°
53°
19
74°
57°
20
Hist. Avg.
73°
55°
21
Hist. Avg.
72°
55°
22
Hist. Avg.
72°
54°
23
Hist. Avg.
72°
54°
24
Hist. Avg.
71°
54°
25
Hist. Avg.
71°
53°
26
Hist. Avg.
70°
53°
27
Hist. Avg.
70°
52°
28
Hist. Avg.
70°
52°
29
Hist. Avg.
69°
52°
30
Hist. Avg.
69°
51°
1
Hist. Avg.
69°
51°
2
Hist. Avg.
68°
50°
3
Hist. Avg.
68°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Chappaqua
Chappaqua's September 2026 forecast shows daily high temperatures ranging from 71° to 82°, with overnight lows between 52° and 62°. The average high for September is 74° with an average low of 56°. 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 Chappaqua. See also: October | November | December.
