S
M
T
W
T
F
S
30
72°
54°
31
71°
55°
1
71°
55°
2
70°
54°
3
71°
53°
4
70°
50°
5
66°
49°
6
67°
53°
7
69°
52°
8
70°
53°
9
68°
52°
10
68°
49°
11
67°
48°
12
68°
49°
13
68°
50°
14
64°
51°
15
65°
47°
16
64°
46°
17
63°
45°
18
63°
47°
19
65°
48°
20
64°
47°
21
63°
46°
22
64°
47°
23
64°
48°
24
63°
49°
25
63°
48°
26
64°
50°
27
65°
51°
28
65°
51°
29
67°
49°
30
Hist. Avg.
61°
46°
1
Hist. Avg.
61°
46°
2
Hist. Avg.
61°
46°
3
Hist. Avg.
60°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Boston
Boston's September 2026 forecast shows daily high temperatures ranging from 63° to 72°, with overnight lows between 45° and 55°. The average high for September is 67° with an average low of 50°. 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 Boston. See also: October | November | December.
