S
M
T
W
T
F
S
30
74°
65°
31
75°
66°
1
80°
63°
2
75°
63°
3
78°
61°
4
75°
59°
5
74°
60°
6
78°
64°
7
79°
64°
8
78°
65°
9
79°
64°
10
76°
64°
11
77°
62°
12
79°
64°
13
78°
63°
14
78°
64°
15
77°
62°
16
78°
57°
17
76°
61°
18
69°
62°
19
75°
61°
20
77°
62°
21
76°
61°
22
75°
54°
23
74°
59°
24
67°
59°
25
68°
61°
26
Hist. Avg.
70°
50°
27
Hist. Avg.
69°
50°
28
Hist. Avg.
69°
50°
29
Hist. Avg.
68°
49°
30
Hist. Avg.
68°
49°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
67°
48°
3
Hist. Avg.
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Old Saybrook
Old Saybrook's September 2026 forecast shows daily high temperatures ranging from 67° to 80°, with overnight lows between 54° and 66°. The average high for September is 76° with an average low of 62°. 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 Old Saybrook. See also: October | November | December.
