S
M
T
W
T
F
S
30
88°
63°
31
93°
68°
1
95°
67°
2
95°
68°
3
96°
70°
4
97°
71°
5
90°
68°
6
82°
63°
7
84°
58°
8
89°
63°
9
92°
69°
10
84°
68°
11
82°
63°
12
81°
68°
13
89°
64°
14
76°
56°
15
92°
58°
16
91°
71°
17
92°
68°
18
81°
69°
19
88°
71°
20
88°
69°
21
69°
59°
22
67°
59°
23
64°
61°
24
66°
50°
25
73°
44°
26
74°
46°
27
75°
44°
28
77°
46°
29
78°
45°
30
82°
59°
1
89°
67°
2
71°
50°
3
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westchester
Westchester's September 2026 forecast shows daily high temperatures ranging from 68° to 89°, with overnight lows between 46° and 67°. The average high for September is 78° 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 Westchester. See also: October | November | December.
