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
90°
73°
8
90°
74°
9
90°
73°
10
92°
74°
11
87°
75°
12
90°
74°
13
95°
73°
14
96°
72°
15
96°
73°
16
92°
75°
17
92°
70°
18
96°
67°
19
97°
70°
20
92°
71°
21
92°
71°
22
90°
72°
23
86°
70°
24
73°
67°
25
79°
63°
26
84°
58°
27
86°
59°
28
86°
58°
29
89°
56°
30
92°
58°
1
87°
68°
2
85°
69°
3
84°
70°
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 84° to 87°, with overnight lows between 68° and 70°. The average high for September is 85° with an average low of 69°. 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.
