S
M
T
W
T
F
S
30
79°
67°
31
78°
69°
1
84°
68°
2
77°
71°
3
85°
71°
4
85°
66°
5
80°
63°
6
75°
63°
7
77°
66°
8
78°
63°
9
78°
66°
10
81°
64°
11
81°
64°
12
75°
61°
13
75°
60°
14
79°
62°
15
73°
62°
16
73°
66°
17
75°
59°
18
71°
57°
19
70°
57°
20
71°
60°
21
75°
64°
22
78°
65°
23
79°
65°
24
78°
62°
25
76°
60°
26
76°
62°
27
77°
63°
28
76°
63°
29
77°
59°
30
69°
55°
1
66°
54°
2
69°
58°
3
74°
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 66° to 85°, with overnight lows between 54° and 71°. The average high for September is 76° 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.
