S
M
T
W
T
F
S
30
92°
69°
31
94°
68°
1
94°
65°
2
90°
64°
3
89°
65°
4
90°
64°
5
91°
67°
6
86°
64°
7
85°
67°
8
86°
67°
9
87°
66°
10
90°
66°
11
90°
65°
12
89°
65°
13
90°
64°
14
90°
65°
15
88°
65°
16
88°
64°
17
89°
64°
18
88°
63°
19
89°
62°
20
88°
63°
21
89°
63°
22
88°
62°
23
88°
62°
24
87°
57°
25
85°
61°
26
84°
61°
27
86°
60°
28
86°
61°
29
85°
60°
30
83°
59°
1
84°
57°
2
80°
51°
3
81°
58°
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 80° to 94°, with overnight lows between 51° and 69°. The average high for September is 88° with an average low of 63°. 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.
