S
M
T
W
T
F
S
30
77°
56°
31
76°
56°
1
76°
62°
2
77°
65°
3
78°
64°
4
84°
65°
5
84°
63°
6
82°
56°
7
78°
56°
8
77°
57°
9
76°
54°
10
74°
54°
11
75°
55°
12
74°
55°
13
77°
59°
14
79°
61°
15
78°
59°
16
74°
56°
17
73°
57°
18
74°
59°
19
75°
51°
20
74°
54°
21
74°
51°
22
78°
50°
23
71°
49°
24
71°
50°
25
70°
56°
26
72°
49°
27
71°
55°
28
71°
55°
29
69°
47°
30
68°
50°
1
68°
55°
2
74°
52°
3
72°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hartsdale
Hartsdale's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 47° and 65°. The average high for September is 75° 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 Hartsdale. See also: October | November | December.
