S
M
T
W
T
F
S
30
84°
63°
31
83°
56°
1
80°
56°
2
77°
57°
3
76°
56°
4
77°
56°
5
76°
57°
6
75°
55°
7
75°
55°
8
76°
56°
9
75°
57°
10
73°
55°
11
75°
55°
12
76°
57°
13
75°
56°
14
76°
55°
15
73°
54°
16
73°
53°
17
71°
52°
18
72°
53°
19
72°
58°
20
74°
57°
21
75°
50°
22
70°
50°
23
Hist. Avg.
72°
54°
24
Hist. Avg.
71°
54°
25
Hist. Avg.
71°
53°
26
Hist. Avg.
70°
53°
27
Hist. Avg.
70°
52°
28
Hist. Avg.
70°
52°
29
Hist. Avg.
69°
52°
30
Hist. Avg.
69°
51°
1
Hist. Avg.
69°
51°
2
Hist. Avg.
68°
50°
3
Hist. Avg.
68°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Darien
Darien's September 2026 forecast shows daily high temperatures ranging from 70° to 84°, with overnight lows between 50° 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 Darien. See also: October | November | December.
