S
M
T
W
T
F
S
30
89°
71°
31
94°
74°
1
98°
74°
2
97°
75°
3
96°
77°
4
96°
75°
5
98°
74°
6
84°
63°
7
86°
65°
8
95°
73°
9
89°
64°
10
81°
59°
11
83°
62°
12
84°
62°
13
81°
61°
14
80°
58°
15
77°
60°
16
79°
59°
17
78°
56°
18
79°
60°
19
77°
55°
20
81°
61°
21
80°
60°
22
77°
59°
23
78°
59°
24
80°
60°
25
80°
61°
26
81°
61°
27
80°
60°
28
78°
61°
29
79°
60°
30
77°
58°
1
76°
54°
2
65°
48°
3
64°
44°
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 64° to 95°, with overnight lows between 44° and 73°. The average high for September is 80° with an average low of 59°. 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.
