S
M
T
W
T
F
S
30
71°
57°
31
72°
59°
1
73°
56°
2
77°
55°
3
74°
52°
4
75°
52°
5
72°
54°
6
77°
57°
7
77°
57°
8
76°
56°
9
76°
57°
10
77°
57°
11
75°
56°
12
77°
56°
13
76°
55°
14
76°
56°
15
75°
54°
16
76°
47°
17
72°
48°
18
66°
54°
19
71°
55°
20
74°
55°
21
74°
53°
22
73°
49°
23
71°
49°
24
71°
46°
25
Hist. Avg.
67°
48°
26
Hist. Avg.
66°
47°
27
Hist. Avg.
66°
47°
28
Hist. Avg.
66°
46°
29
Hist. Avg.
65°
46°
30
Hist. Avg.
65°
46°
1
Hist. Avg.
64°
45°
2
Hist. Avg.
64°
45°
3
Hist. Avg.
63°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Chelsea
Chelsea's September 2026 forecast shows daily high temperatures ranging from 66° to 77°, with overnight lows between 46° and 59°. The average high for September is 74° with an average low of 54°. 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.
