S
M
T
W
T
F
S
30
83°
68°
31
79°
69°
1
90°
72°
2
82°
73°
3
89°
72°
4
82°
65°
5
77°
62°
6
77°
61°
7
79°
64°
8
81°
62°
9
79°
65°
10
80°
60°
11
81°
58°
12
73°
57°
13
72°
57°
14
78°
60°
15
71°
59°
16
72°
62°
17
72°
56°
18
70°
53°
19
69°
53°
20
70°
56°
21
74°
60°
22
77°
61°
23
78°
61°
24
78°
59°
25
75°
57°
26
75°
58°
27
76°
59°
28
76°
58°
29
77°
57°
30
69°
52°
1
66°
51°
2
69°
55°
3
73°
56°
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 66° to 90°, with overnight lows between 51° and 73°. The average high for September is 76° with an average low of 60°. 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.
