S
M
T
W
T
F
S
30
91°
71°
31
91°
71°
1
90°
72°
2
92°
71°
3
91°
71°
4
88°
70°
5
89°
69°
6
90°
68°
7
90°
70°
8
91°
70°
9
92°
69°
10
91°
70°
11
91°
70°
12
90°
69°
13
90°
70°
14
88°
66°
15
90°
68°
16
90°
67°
17
89°
68°
18
90°
64°
19
88°
59°
20
81°
60°
21
81°
60°
22
82°
58°
23
85°
61°
24
86°
64°
25
86°
62°
26
83°
60°
27
78°
62°
28
82°
62°
29
81°
61°
30
84°
61°
1
84°
60°
2
83°
61°
3
84°
60°
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 78° to 92°, with overnight lows between 58° and 72°. The average high for September is 87° with an average low of 66°. 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.
