S
M
T
W
T
F
S
30
67°
63°
31
75°
65°
1
86°
68°
2
84°
67°
3
82°
64°
4
75°
61°
5
76°
58°
6
72°
55°
7
77°
52°
8
78°
54°
9
75°
65°
10
78°
54°
11
74°
49°
12
81°
53°
13
82°
55°
14
70°
49°
15
74°
52°
16
80°
62°
17
72°
60°
18
72°
51°
19
66°
57°
20
69°
50°
21
60°
50°
22
61°
50°
23
62°
52°
24
64°
50°
25
67°
51°
26
69°
52°
27
70°
49°
28
65°
49°
29
67°
52°
30
66°
50°
1
64°
51°
2
66°
45°
3
60°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ancaster
Ancaster's September 2026 forecast shows daily high temperatures ranging from 60° to 70°, with overnight lows between 45° and 57°. The average high for September is 65° with an average low of 51°. 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 Ancaster. See also: October | November | December.
