S
M
T
W
T
F
S
30
74°
58°
31
70°
56°
1
78°
64°
2
75°
59°
3
75°
53°
4
75°
51°
5
74°
52°
6
74°
49°
7
80°
52°
8
73°
60°
9
75°
58°
10
66°
44°
11
73°
39°
12
74°
52°
13
66°
44°
14
62°
41°
15
63°
47°
16
69°
46°
17
71°
49°
18
60°
41°
19
63°
38°
20
62°
42°
21
52°
38°
22
62°
36°
23
66°
39°
24
68°
40°
25
65°
40°
26
70°
41°
27
71°
49°
28
72°
46°
29
75°
49°
30
64°
55°
1
64°
54°
2
59°
38°
3
59°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chelmsford
Chelmsford's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Chelmsford. See also: October | November | December.
