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°
-100°
9
68°
64°
10
77°
49°
11
68°
44°
12
73°
53°
13
78°
55°
14
71°
55°
15
69°
55°
16
67°
49°
17
68°
48°
18
61°
44°
19
58°
41°
20
61°
44°
21
60°
43°
22
61°
43°
23
63°
47°
24
65°
45°
25
58°
37°
26
59°
38°
27
58°
46°
28
60°
45°
29
57°
39°
30
59°
43°
1
60°
45°
2
56°
40°
3
63°
44°
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 56° to 78°, with overnight lows between 37° and 64°. 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.
