S
M
T
W
T
F
S
30
79°
67°
31
78°
69°
1
82°
67°
2
71°
65°
3
84°
67°
4
84°
71°
5
79°
68°
6
76°
64°
7
78°
61°
8
80°
62°
9
82°
68°
10
84°
69°
11
84°
64°
12
80°
71°
13
81°
68°
14
81°
60°
15
76°
65°
16
80°
70°
17
82°
66°
18
80°
65°
19
74°
59°
20
72°
59°
21
70°
60°
22
72°
60°
23
72°
61°
24
75°
59°
25
67°
55°
26
68°
56°
27
72°
62°
28
76°
59°
29
69°
54°
30
70°
61°
1
71°
59°
2
67°
55°
3
70°
61°
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 67° to 84°, with overnight lows between 54° and 71°. The average high for September is 74° with an average low of 61°. 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.
