S
M
T
W
T
F
S
30
70°
61°
31
75°
57°
1
72°
54°
2
68°
61°
3
75°
64°
4
72°
55°
5
73°
52°
6
77°
54°
7
75°
57°
8
63°
52°
9
66°
53°
10
68°
59°
11
72°
54°
12
73°
61°
13
73°
57°
14
73°
61°
15
73°
54°
16
67°
53°
17
68°
55°
18
70°
57°
19
72°
56°
20
71°
55°
21
70°
56°
22
68°
50°
23
69°
50°
24
68°
49°
25
66°
48°
26
64°
48°
27
66°
50°
28
65°
44°
29
60°
43°
30
59°
43°
1
59°
48°
2
63°
49°
3
63°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Belmont
Belmont's September 2026 forecast shows daily high temperatures ranging from 59° to 73°, with overnight lows between 43° and 61°. The average high for September is 67° 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 Belmont. See also: October | November | December.
