S
M
T
W
T
F
S
30
90°
66°
31
90°
69°
1
89°
66°
2
89°
65°
3
88°
68°
4
89°
63°
5
88°
67°
6
90°
66°
7
89°
67°
8
88°
66°
9
88°
66°
10
87°
65°
11
88°
66°
12
86°
65°
13
83°
65°
14
83°
64°
15
82°
65°
16
84°
64°
17
83°
62°
18
82°
60°
19
82°
63°
20
81°
58°
21
80°
57°
22
80°
58°
23
81°
59°
24
83°
61°
25
84°
62°
26
83°
61°
27
84°
61°
28
79°
59°
29
82°
56°
30
80°
56°
1
Hist. Avg.
82°
59°
2
Hist. Avg.
82°
59°
3
Hist. Avg.
82°
58°
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 79° to 90°, with overnight lows between 56° and 69°. The average high for September is 85° 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.
