S
M
T
W
T
F
S
30
78°
56°
31
84°
58°
1
85°
50°
2
84°
51°
3
77°
50°
4
78°
52°
5
79°
58°
6
82°
56°
7
84°
50°
8
76°
55°
9
75°
56°
10
77°
56°
11
80°
55°
12
80°
54°
13
74°
54°
14
73°
48°
15
75°
47°
16
73°
46°
17
73°
49°
18
72°
52°
19
78°
52°
20
74°
53°
21
77°
51°
22
75°
44°
23
72°
50°
24
70°
52°
25
75°
47°
26
68°
46°
27
74°
49°
28
73°
47°
29
66°
48°
30
Hist. Avg.
68°
46°
1
Hist. Avg.
68°
46°
2
Hist. Avg.
67°
45°
3
Hist. Avg.
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Marlborough
Marlborough's September 2026 forecast shows daily high temperatures ranging from 66° to 85°, with overnight lows between 44° and 58°. The average high for September is 76° 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.
