S
M
T
W
T
F
S
30
80°
62°
31
84°
65°
1
85°
64°
2
86°
65°
3
86°
60°
4
84°
55°
5
78°
57°
6
78°
61°
7
82°
62°
8
82°
61°
9
83°
62°
10
78°
61°
11
83°
60°
12
83°
62°
13
82°
61°
14
82°
61°
15
83°
60°
16
83°
60°
17
81°
59°
18
81°
53°
19
78°
52°
20
75°
50°
21
72°
49°
22
72°
54°
23
75°
53°
24
77°
49°
25
71°
49°
26
72°
50°
27
71°
49°
28
76°
54°
29
75°
53°
30
77°
55°
1
74°
54°
2
74°
53°
3
69°
53°
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 69° to 86°, with overnight lows between 49° and 65°. The average high for September is 79° with an average low of 57°. 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.
