S
M
T
W
T
F
S
30
93°
72°
31
95°
72°
1
97°
72°
2
98°
73°
3
99°
74°
4
98°
75°
5
96°
73°
6
99°
76°
7
97°
72°
8
93°
75°
9
95°
71°
10
96°
70°
11
90°
73°
12
95°
73°
13
96°
69°
14
98°
69°
15
98°
71°
16
95°
73°
17
94°
70°
18
97°
68°
19
99°
71°
20
97°
70°
21
94°
70°
22
93°
69°
23
90°
67°
24
79°
64°
25
81°
60°
26
84°
59°
27
83°
55°
28
86°
57°
29
89°
59°
30
88°
66°
1
87°
66°
2
84°
69°
3
82°
67°
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 81° to 89°, with overnight lows between 55° and 69°. The average high for September is 85° with an average low of 62°. 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.
