S
M
T
W
T
F
S
30
88°
65°
31
83°
65°
1
82°
66°
2
82°
65°
3
83°
70°
4
82°
64°
5
86°
65°
6
82°
64°
7
81°
63°
8
80°
64°
9
80°
63°
10
82°
68°
11
85°
69°
12
80°
67°
13
80°
68°
14
85°
68°
15
Hist. Avg.
81°
65°
16
Hist. Avg.
80°
65°
17
Hist. Avg.
80°
64°
18
Hist. Avg.
80°
64°
19
Hist. Avg.
79°
64°
20
Hist. Avg.
79°
63°
21
Hist. Avg.
79°
63°
22
Hist. Avg.
78°
62°
23
Hist. Avg.
78°
62°
24
Hist. Avg.
78°
62°
25
Hist. Avg.
77°
61°
26
Hist. Avg.
77°
61°
27
Hist. Avg.
76°
60°
28
Hist. Avg.
76°
60°
29
Hist. Avg.
76°
60°
30
Hist. Avg.
75°
59°
1
Hist. Avg.
75°
59°
2
Hist. Avg.
74°
58°
3
Hist. Avg.
74°
58°
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 80° to 88°, with overnight lows between 63° and 70°. The average high for September is 83° with an average low of 66°. 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.
