S
M
T
W
T
F
S
30
66°
55°
31
64°
52°
1
61°
55°
2
61°
55°
3
63°
57°
4
63°
55°
5
63°
52°
6
66°
55°
7
60°
50°
8
59°
46°
9
61°
49°
10
62°
51°
11
61°
48°
12
61°
56°
13
64°
52°
14
64°
50°
15
61°
46°
16
59°
48°
17
60°
48°
18
60°
47°
19
61°
50°
20
61°
51°
21
61°
51°
22
60°
50°
23
61°
50°
24
62°
46°
25
58°
44°
26
58°
43°
27
59°
48°
28
60°
48°
29
59°
47°
30
59°
45°
1
58°
49°
2
60°
48°
3
58°
48°
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 58° to 64°, with overnight lows between 43° and 56°. The average high for September is 60° with an average low of 48°. 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.
