S
M
T
W
T
F
S
30
77°
60°
31
79°
63°
1
82°
63°
2
82°
62°
3
83°
56°
4
80°
54°
5
75°
55°
6
75°
61°
7
76°
61°
8
79°
60°
9
80°
61°
10
76°
60°
11
80°
59°
12
80°
60°
13
79°
60°
14
77°
59°
15
80°
60°
16
80°
56°
17
78°
59°
18
76°
53°
19
77°
51°
20
71°
50°
21
69°
48°
22
69°
55°
23
70°
52°
24
74°
49°
25
68°
48°
26
67°
48°
27
69°
49°
28
73°
54°
29
72°
52°
30
73°
50°
1
67°
53°
2
67°
45°
3
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lewisboro
Lewisboro's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 45° and 63°. 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 Lewisboro. See also: October | November | December.
