S
M
T
W
T
F
S
30
98°
74°
31
100°
73°
1
98°
73°
2
102°
72°
3
99°
73°
4
96°
75°
5
99°
70°
6
97°
72°
7
100°
73°
8
99°
74°
9
98°
74°
10
98°
75°
11
97°
73°
12
101°
73°
13
98°
74°
14
97°
73°
15
98°
70°
16
92°
69°
17
92°
69°
18
89°
67°
19
89°
63°
20
85°
63°
21
87°
62°
22
91°
68°
23
90°
67°
24
84°
66°
25
79°
66°
26
86°
65°
27
85°
66°
28
87°
66°
29
87°
65°
30
85°
58°
1
77°
54°
2
77°
55°
3
75°
54°
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 101°, with overnight lows between 54° and 75°. The average high for September is 89° with an average low of 67°. 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.
