S
M
T
W
T
F
S
30
69°
65°
31
74°
65°
1
87°
68°
2
87°
68°
3
85°
66°
4
76°
62°
5
79°
58°
6
72°
54°
7
80°
52°
8
79°
54°
9
76°
60°
10
81°
54°
11
77°
51°
12
78°
50°
13
84°
55°
14
72°
48°
15
76°
50°
16
79°
62°
17
75°
59°
18
73°
51°
19
64°
50°
20
72°
57°
21
59°
54°
22
62°
51°
23
66°
54°
24
65°
44°
25
69°
41°
26
73°
48°
27
78°
53°
28
78°
56°
29
72°
56°
30
74°
63°
1
71°
57°
2
66°
47°
3
61°
50°
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 61° to 74°, with overnight lows between 47° and 63°. The average high for September is 69° with an average low of 55°. 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.
