S
M
T
W
T
F
S
30
73°
55°
31
76°
50°
1
74°
52°
2
69°
61°
3
79°
60°
4
75°
56°
5
70°
57°
6
69°
48°
7
75°
46°
8
70°
49°
9
72°
47°
10
76°
57°
11
65°
45°
12
73°
41°
13
70°
57°
14
64°
42°
15
68°
54°
16
75°
55°
17
69°
55°
18
66°
45°
19
63°
47°
20
62°
44°
21
59°
42°
22
60°
43°
23
62°
44°
24
65°
45°
25
65°
46°
26
66°
41°
27
58°
46°
28
68°
45°
29
66°
41°
30
59°
37°
1
61°
43°
2
62°
44°
3
63°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chelsea
Chelsea's September 2026 forecast shows daily high temperatures ranging from 58° to 75°, with overnight lows between 37° and 57°. The average high for September is 64° with an average low of 46°. 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 Chelsea. See also: October | November | December.
