S
M
T
W
T
F
S
30
77°
62°
31
71°
56°
1
71°
60°
2
73°
62°
3
71°
61°
4
71°
60°
5
72°
56°
6
70°
57°
7
74°
60°
8
77°
61°
9
77°
61°
10
76°
60°
11
75°
59°
12
76°
59°
13
77°
60°
14
76°
57°
15
66°
55°
16
67°
56°
17
68°
57°
18
71°
57°
19
72°
56°
20
68°
54°
21
65°
53°
22
67°
55°
23
72°
56°
24
73°
56°
25
73°
55°
26
72°
56°
27
73°
56°
28
63°
56°
29
68°
52°
30
70°
49°
1
62°
50°
2
59°
43°
3
64°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hamilton
Hamilton's September 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 37° and 62°. The average high for September is 71° 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 Hamilton. See also: October | November | December.
