S
M
T
W
T
F
S
30
76°
54°
31
73°
52°
1
70°
53°
2
70°
51°
3
71°
51°
4
71°
52°
5
70°
52°
6
70°
55°
7
71°
59°
8
70°
52°
9
70°
52°
10
71°
51°
11
69°
52°
12
68°
53°
13
69°
54°
14
68°
52°
15
67°
54°
16
69°
49°
17
68°
48°
18
68°
49°
19
66°
56°
20
74°
54°
21
65°
48°
22
64°
45°
23
Hist. Avg.
69°
49°
24
Hist. Avg.
68°
49°
25
Hist. Avg.
68°
48°
26
Hist. Avg.
68°
48°
27
Hist. Avg.
67°
48°
28
Hist. Avg.
67°
47°
29
Hist. Avg.
67°
47°
30
Hist. Avg.
66°
47°
1
Hist. Avg.
66°
46°
2
Hist. Avg.
65°
46°
3
Hist. Avg.
65°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Hamilton
Hamilton's September 2026 forecast shows daily high temperatures ranging from 64° to 76°, with overnight lows between 45° and 59°. The average high for September is 70° with an average low of 52°. 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.
