S
M
T
W
T
F
S
30
86°
65°
31
73°
63°
1
69°
63°
2
72°
64°
3
73°
63°
4
85°
66°
5
73°
64°
6
68°
59°
7
82°
59°
8
81°
64°
9
76°
61°
10
87°
71°
11
79°
63°
12
71°
56°
13
70°
63°
14
74°
58°
15
66°
53°
16
80°
56°
17
76°
64°
18
80°
52°
19
64°
51°
20
63°
53°
21
66°
50°
22
62°
49°
23
62°
53°
24
61°
53°
25
63°
53°
26
64°
54°
27
66°
53°
28
68°
55°
29
69°
56°
30
67°
56°
1
69°
52°
2
71°
57°
3
63°
56°
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 61° to 80°, with overnight lows between 49° and 57°. The average high for September is 66° with an average low of 53°. 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.
