S
M
T
W
T
F
S
30
82°
59°
31
81°
52°
1
78°
51°
2
74°
53°
3
74°
52°
4
75°
52°
5
73°
51°
6
73°
50°
7
74°
50°
8
73°
51°
9
73°
55°
10
71°
50°
11
74°
51°
12
75°
52°
13
74°
53°
14
75°
52°
15
71°
49°
16
71°
49°
17
68°
48°
18
70°
50°
19
74°
53°
20
Hist. Avg.
69°
52°
21
Hist. Avg.
69°
51°
22
Hist. Avg.
68°
51°
23
Hist. Avg.
68°
51°
24
Hist. Avg.
68°
50°
25
Hist. Avg.
67°
50°
26
Hist. Avg.
67°
49°
27
Hist. Avg.
66°
49°
28
Hist. Avg.
66°
49°
29
Hist. Avg.
65°
48°
30
Hist. Avg.
65°
48°
1
Hist. Avg.
65°
48°
2
Hist. Avg.
64°
47°
3
Hist. Avg.
64°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Westborough
Westborough's September 2026 forecast shows daily high temperatures ranging from 68° to 82°, with overnight lows between 48° and 59°. The average high for September is 74° with an average low of 52°. 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 Westborough. See also: October | November | December.
