S
M
T
W
T
F
S
30
82°
64°
31
81°
63°
1
82°
59°
2
75°
57°
3
74°
59°
4
74°
58°
5
75°
55°
6
76°
62°
7
79°
62°
8
74°
61°
9
74°
60°
10
77°
60°
11
80°
60°
12
80°
61°
13
79°
61°
14
80°
51°
15
73°
51°
16
71°
52°
17
70°
51°
18
70°
49°
19
69°
51°
20
70°
53°
21
76°
55°
22
76°
56°
23
77°
49°
24
77°
47°
25
70°
47°
26
68°
50°
27
73°
54°
28
74°
54°
29
74°
48°
30
73°
47°
1
67°
47°
2
67°
48°
3
71°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brockton
Brockton's September 2026 forecast shows daily high temperatures ranging from 67° to 82°, with overnight lows between 47° and 64°. The average high for September is 75° with an average low of 55°. 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 Brockton. See also: October | November | December.
