S
M
T
W
T
F
S
30
90°
66°
31
89°
65°
1
90°
66°
2
89°
67°
3
89°
68°
4
88°
68°
5
87°
67°
6
86°
65°
7
88°
65°
8
86°
68°
9
86°
68°
10
87°
66°
11
84°
66°
12
87°
67°
13
87°
67°
14
86°
66°
15
84°
66°
16
81°
64°
17
86°
67°
18
87°
66°
19
86°
64°
20
82°
63°
21
79°
64°
22
80°
61°
23
83°
57°
24
79°
57°
25
78°
58°
26
78°
62°
27
80°
60°
28
77°
56°
29
77°
56°
30
76°
60°
1
77°
58°
2
76°
52°
3
75°
52°
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 75° to 90°, with overnight lows between 52° and 68°. The average high for September is 83° with an average low of 63°. 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.
