S
M
T
W
T
F
S
30
71°
42°
31
82°
37°
1
88°
45°
2
66°
46°
3
66°
45°
4
68°
49°
5
75°
49°
6
69°
54°
7
60°
47°
8
68°
41°
9
77°
38°
10
84°
41°
11
71°
49°
12
72°
49°
13
67°
47°
14
55°
44°
15
64°
39°
16
71°
41°
17
76°
43°
18
77°
46°
19
66°
53°
20
75°
42°
21
78°
41°
22
79°
42°
23
75°
44°
24
84°
43°
25
75°
43°
26
60°
34°
27
57°
30°
28
71°
36°
29
72°
53°
30
68°
41°
1
67°
43°
2
76°
40°
3
72°
40°
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 67° to 76°, with overnight lows between 40° and 53°. The average high for September is 71° with an average low of 43°. 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.
