S
M
T
W
T
F
S
30
81°
55°
31
73°
63°
1
72°
59°
2
73°
59°
3
79°
59°
4
81°
64°
5
72°
57°
6
66°
55°
7
75°
55°
8
79°
59°
9
79°
59°
10
81°
64°
11
75°
57°
12
73°
50°
13
70°
59°
14
72°
57°
15
66°
48°
16
72°
46°
17
77°
61°
18
75°
61°
19
63°
52°
20
63°
54°
21
63°
55°
22
64°
55°
23
63°
55°
24
64°
54°
25
63°
57°
26
61°
58°
27
66°
59°
28
65°
57°
29
66°
56°
30
72°
56°
1
70°
58°
2
72°
56°
3
68°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bourne
Bourne's September 2026 forecast shows daily high temperatures ranging from 61° to 72°, with overnight lows between 53° and 59°. The average high for September is 67° with an average low of 56°. 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 Bourne. See also: October | November | December.
