S
M
T
W
T
F
S
30
75°
47°
31
73°
48°
1
72°
47°
2
71°
44°
3
70°
46°
4
70°
46°
5
71°
45°
6
73°
46°
7
79°
40°
8
72°
33°
9
66°
38°
10
68°
37°
11
70°
36°
12
72°
34°
13
70°
35°
14
73°
42°
15
79°
40°
16
78°
43°
17
79°
43°
18
78°
44°
19
79°
42°
20
78°
49°
21
79°
45°
22
79°
45°
23
77°
40°
24
73°
43°
25
65°
40°
26
62°
39°
27
66°
40°
28
70°
34°
29
65°
43°
30
71°
33°
1
64°
39°
2
70°
41°
3
73°
38°
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 62° to 79°, with overnight lows between 33° and 49°. The average high for September is 72° with an average low of 41°. 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.
