S
M
T
W
T
F
S
30
82°
67°
31
85°
66°
1
86°
64°
2
81°
60°
3
80°
62°
4
81°
64°
5
81°
63°
6
82°
65°
7
83°
62°
8
81°
61°
9
81°
59°
10
80°
60°
11
81°
61°
12
82°
64°
13
83°
61°
14
84°
60°
15
81°
67°
16
81°
66°
17
79°
67°
18
79°
67°
19
80°
66°
20
79°
66°
21
79°
65°
22
82°
66°
23
82°
67°
24
83°
67°
25
85°
66°
26
85°
65°
27
84°
63°
28
82°
62°
29
82°
64°
30
81°
65°
1
83°
66°
2
85°
65°
3
86°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Larchmont
Larchmont's September 2026 forecast shows daily high temperatures ranging from 79° to 86°, with overnight lows between 59° and 67°. The average high for September is 82° with an average low of 64°. 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 Larchmont. See also: October | November | December.
