S
M
T
W
T
F
S
30
93°
74°
31
94°
74°
1
96°
75°
2
97°
76°
3
98°
76°
4
96°
76°
5
90°
75°
6
97°
74°
7
86°
71°
8
90°
70°
9
85°
72°
10
86°
70°
11
88°
69°
12
88°
67°
13
89°
66°
14
88°
67°
15
86°
64°
16
84°
64°
17
85°
65°
18
86°
62°
19
83°
63°
20
84°
59°
21
87°
65°
22
86°
64°
23
86°
65°
24
85°
64°
25
85°
64°
26
84°
63°
27
86°
64°
28
85°
64°
29
84°
63°
30
84°
63°
1
83°
62°
2
83°
60°
3
75°
57°
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 75° to 90°, with overnight lows between 57° and 72°. The average high for September is 85° with an average low of 65°. 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.
