S
M
T
W
T
F
S
30
93°
71°
31
93°
67°
1
88°
64°
2
88°
64°
3
89°
69°
4
92°
66°
5
92°
66°
6
91°
68°
7
92°
68°
8
91°
67°
9
91°
64°
10
86°
62°
11
88°
66°
12
90°
61°
13
85°
60°
14
83°
59°
15
84°
60°
16
84°
59°
17
86°
60°
18
89°
64°
19
85°
65°
20
89°
58°
21
Hist. Avg.
85°
63°
22
Hist. Avg.
85°
62°
23
Hist. Avg.
84°
62°
24
Hist. Avg.
84°
62°
25
Hist. Avg.
84°
62°
26
Hist. Avg.
83°
61°
27
Hist. Avg.
83°
61°
28
Hist. Avg.
83°
60°
29
Hist. Avg.
82°
60°
30
Hist. Avg.
82°
60°
1
Hist. Avg.
82°
59°
2
Hist. Avg.
81°
59°
3
Hist. Avg.
81°
59°
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 83° to 93°, with overnight lows between 58° and 71°. The average high for September is 89° with an average low of 64°. 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.
