S
M
T
W
T
F
S
30
72°
49°
31
71°
49°
1
70°
51°
2
71°
51°
3
71°
53°
4
72°
52°
5
72°
50°
6
71°
49°
7
70°
48°
8
69°
46°
9
69°
53°
10
70°
47°
11
67°
47°
12
71°
46°
13
72°
53°
14
74°
48°
15
72°
52°
16
74°
52°
17
74°
53°
18
73°
52°
19
74°
51°
20
74°
48°
21
67°
51°
22
65°
46°
23
67°
49°
24
66°
48°
25
62°
44°
26
69°
40°
27
68°
42°
28
59°
41°
29
58°
43°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
44°
3
Hist. Avg.
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Halton Hills
Halton Hills's September 2026 forecast shows daily high temperatures ranging from 58° to 74°, with overnight lows between 40° and 53°. The average high for September is 69° with an average low of 49°. 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 Halton Hills. See also: October | November | December.
