S
M
T
W
T
F
S
30
66°
52°
31
67°
52°
1
68°
51°
2
68°
50°
3
69°
56°
4
67°
54°
5
70°
50°
6
67°
49°
7
66°
52°
8
67°
55°
9
66°
56°
10
67°
51°
11
68°
49°
12
64°
49°
13
68°
55°
14
70°
55°
15
Hist. Avg.
70°
50°
16
Hist. Avg.
69°
49°
17
Hist. Avg.
69°
49°
18
Hist. Avg.
68°
49°
19
Hist. Avg.
68°
48°
20
Hist. Avg.
68°
48°
21
Hist. Avg.
67°
48°
22
Hist. Avg.
67°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
45°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
44°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
43°
3
Hist. Avg.
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Stonington
Stonington's September 2026 forecast shows daily high temperatures ranging from 64° to 70°, with overnight lows between 49° and 56°. The average high for September is 67° with an average low of 52°. 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 Stonington. See also: October | November | December.
