S
M
T
W
T
F
S
30
78°
48°
31
70°
47°
1
70°
50°
2
74°
54°
3
70°
47°
4
69°
55°
5
69°
53°
6
76°
48°
7
72°
47°
8
69°
46°
9
67°
45°
10
67°
51°
11
68°
44°
12
67°
43°
13
66°
44°
14
67°
51°
15
72°
49°
16
68°
41°
17
69°
41°
18
63°
40°
19
62°
41°
20
62°
43°
21
63°
44°
22
61°
41°
23
61°
46°
24
65°
45°
25
67°
46°
26
68°
47°
27
68°
41°
28
67°
37°
29
59°
37°
30
59°
44°
1
58°
45°
2
63°
46°
3
65°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lyme
Lyme's September 2026 forecast shows daily high temperatures ranging from 58° to 78°, with overnight lows between 37° and 55°. The average high for September is 67° with an average low of 45°. 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 Lyme. See also: October | November | December.
