S
M
T
W
T
F
S
30
82°
53°
31
72°
53°
1
72°
60°
2
77°
59°
3
74°
52°
4
75°
58°
5
79°
51°
6
71°
52°
7
71°
52°
8
69°
49°
9
69°
50°
10
71°
53°
11
71°
48°
12
69°
47°
13
68°
48°
14
72°
52°
15
72°
48°
16
67°
47°
17
66°
46°
18
64°
44°
19
64°
46°
20
65°
49°
21
64°
51°
22
65°
46°
23
68°
53°
24
70°
49°
25
70°
54°
26
72°
52°
27
72°
44°
28
66°
44°
29
62°
51°
30
66°
51°
1
63°
52°
2
66°
49°
3
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Darien
Darien's September 2026 forecast shows daily high temperatures ranging from 62° to 82°, with overnight lows between 43° and 60°. The average high for September is 69° with an average low of 50°. 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 Darien. See also: October | November | December.
