S
M
T
W
T
F
S
30
81°
63°
31
81°
65°
1
83°
65°
2
81°
64°
3
81°
58°
4
80°
54°
5
79°
56°
6
79°
56°
7
81°
57°
8
85°
59°
9
85°
62°
10
84°
55°
11
78°
54°
12
78°
56°
13
79°
53°
14
77°
53°
15
75°
54°
16
76°
53°
17
75°
52°
18
76°
53°
19
80°
51°
20
76°
56°
21
80°
54°
22
77°
58°
23
81°
58°
24
80°
57°
25
79°
57°
26
77°
56°
27
78°
56°
28
81°
57°
29
81°
54°
30
78°
55°
1
79°
56°
2
80°
50°
3
80°
45°
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 75° to 85°, with overnight lows between 45° and 65°. The average high for September is 79° with an average low of 56°. 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.
