S
M
T
W
T
F
S
30
79°
57°
31
80°
57°
1
78°
58°
2
78°
58°
3
77°
59°
4
76°
58°
5
79°
58°
6
78°
57°
7
76°
55°
8
77°
54°
9
75°
55°
10
76°
60°
11
75°
54°
12
75°
54°
13
77°
53°
14
78°
59°
15
76°
59°
16
76°
56°
17
73°
52°
18
73°
52°
19
74°
53°
20
78°
58°
21
74°
52°
22
72°
54°
23
77°
56°
24
76°
57°
25
77°
56°
26
72°
48°
27
74°
50°
28
68°
49°
29
67°
49°
30
69°
48°
1
69°
49°
2
67°
45°
3
Hist. Avg.
68°
50°
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 67° to 80°, with overnight lows between 45° and 60°. The average high for September is 75° with an average low of 54°. 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.
