S
M
T
W
T
F
S
30
80°
61°
31
79°
69°
1
78°
67°
2
74°
65°
3
88°
69°
4
85°
73°
5
80°
68°
6
73°
61°
7
81°
62°
8
82°
66°
9
81°
71°
10
85°
65°
11
77°
63°
12
76°
64°
13
80°
67°
14
81°
64°
15
78°
65°
16
77°
59°
17
75°
60°
18
74°
60°
19
73°
61°
20
74°
58°
21
75°
62°
22
68°
61°
23
68°
61°
24
69°
60°
25
70°
58°
26
71°
59°
27
68°
55°
28
67°
59°
29
73°
60°
30
74°
60°
1
73°
59°
2
72°
60°
3
71°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cold Spring Harbor
Cold Spring Harbor's September 2026 forecast shows daily high temperatures ranging from 67° to 85°, with overnight lows between 55° and 71°. The average high for September is 75° with an average low of 61°. 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 Cold Spring Harbor. See also: October | November | December.
