S
M
T
W
T
F
S
30
75°
55°
31
79°
57°
1
82°
57°
2
82°
55°
3
80°
51°
4
81°
55°
5
80°
53°
6
80°
49°
7
72°
53°
8
71°
54°
9
72°
49°
10
75°
45°
11
71°
54°
12
77°
47°
13
78°
51°
14
77°
49°
15
70°
53°
16
76°
51°
17
Hist. Avg.
72°
47°
18
Hist. Avg.
71°
47°
19
Hist. Avg.
71°
46°
20
Hist. Avg.
70°
46°
21
Hist. Avg.
70°
46°
22
Hist. Avg.
69°
45°
23
Hist. Avg.
69°
45°
24
Hist. Avg.
69°
44°
25
Hist. Avg.
68°
44°
26
Hist. Avg.
68°
44°
27
Hist. Avg.
67°
43°
28
Hist. Avg.
67°
43°
29
Hist. Avg.
66°
42°
30
Hist. Avg.
66°
42°
1
Hist. Avg.
66°
42°
2
Hist. Avg.
65°
41°
3
Hist. Avg.
65°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Greenwich
Greenwich's September 2026 forecast shows daily high temperatures ranging from 70° to 82°, with overnight lows between 45° and 57°. The average high for September is 77° 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 Greenwich. See also: October | November | December.
