S
M
T
W
T
F
S
30
66°
56°
31
68°
52°
1
67°
50°
2
65°
54°
3
65°
50°
4
70°
49°
5
67°
51°
6
66°
53°
7
68°
54°
8
68°
55°
9
69°
51°
10
68°
54°
11
67°
54°
12
67°
53°
13
69°
53°
14
68°
54°
15
69°
52°
16
67°
51°
17
64°
53°
18
65°
52°
19
67°
47°
20
63°
48°
21
62°
47°
22
61°
46°
23
62°
51°
24
65°
52°
25
64°
53°
26
66°
52°
27
65°
52°
28
65°
50°
29
62°
49°
30
59°
47°
1
59°
44°
2
60°
43°
3
59°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Marlborough
Marlborough's September 2026 forecast shows daily high temperatures ranging from 59° to 70°, with overnight lows between 43° and 56°. The average high for September is 65° with an average low of 51°. 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 Marlborough. See also: October | November | December.
