S
M
T
W
T
F
S
30
82°
63°
31
81°
66°
1
80°
63°
2
81°
65°
3
79°
66°
4
80°
64°
5
79°
64°
6
79°
63°
7
78°
64°
8
78°
63°
9
77°
62°
10
77°
63°
11
79°
62°
12
79°
62°
13
78°
63°
14
78°
62°
15
75°
63°
16
77°
60°
17
76°
60°
18
70°
59°
19
73°
52°
20
67°
51°
21
67°
59°
22
68°
52°
23
68°
51°
24
66°
52°
25
67°
56°
26
70°
56°
27
66°
53°
28
65°
51°
29
64°
50°
30
65°
49°
1
67°
54°
2
67°
57°
3
68°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in East Boston
East Boston's September 2026 forecast shows daily high temperatures ranging from 64° to 82°, with overnight lows between 49° and 66°. The average high for September is 73° with an average low of 59°. 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 East Boston. See also: October | November | December.
