S
M
T
W
T
F
S
30
88°
63°
31
93°
68°
1
95°
67°
2
95°
68°
3
96°
70°
4
97°
71°
5
90°
68°
6
82°
63°
7
83°
64°
8
89°
68°
9
93°
70°
10
77°
60°
11
83°
59°
12
85°
61°
13
88°
65°
14
83°
62°
15
78°
57°
16
78°
56°
17
81°
57°
18
80°
58°
19
80°
54°
20
75°
52°
21
82°
57°
22
74°
57°
23
77°
56°
24
81°
57°
25
82°
58°
26
82°
57°
27
81°
57°
28
81°
56°
29
80°
57°
30
81°
56°
1
81°
54°
2
78°
46°
3
67°
43°
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 67° to 93°, with overnight lows between 43° and 70°. The average high for September is 81° with an average low of 58°. 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.
