S
M
T
W
T
F
S
30
87°
70°
31
94°
67°
1
96°
73°
2
100°
73°
3
99°
71°
4
99°
71°
5
92°
69°
6
82°
65°
7
83°
57°
8
85°
58°
9
86°
66°
10
90°
72°
11
84°
68°
12
85°
66°
13
87°
64°
14
87°
67°
15
86°
64°
16
82°
62°
17
82°
62°
18
83°
61°
19
82°
58°
20
81°
60°
21
84°
65°
22
83°
64°
23
78°
63°
24
78°
63°
25
79°
62°
26
82°
63°
27
83°
62°
28
81°
62°
29
82°
61°
30
81°
61°
1
81°
60°
2
80°
61°
3
80°
59°
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 78° to 90°, with overnight lows between 57° and 72°. The average high for September is 83° 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.
