S
M
T
W
T
F
S
30
73°
59°
31
70°
55°
1
72°
52°
2
68°
57°
3
73°
63°
4
68°
57°
5
68°
55°
6
75°
52°
7
70°
61°
8
63°
50°
9
65°
48°
10
67°
55°
11
68°
46°
12
69°
57°
13
70°
54°
14
73°
59°
15
68°
51°
16
64°
50°
17
65°
51°
18
65°
49°
19
66°
51°
20
65°
50°
21
66°
53°
22
66°
52°
23
65°
52°
24
66°
51°
25
64°
47°
26
62°
45°
27
63°
46°
28
63°
50°
29
62°
50°
30
63°
48°
1
62°
44°
2
63°
49°
3
63°
50°
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 62° to 73°, with overnight lows between 44° and 59°. The average high for September is 65° with an average low of 50°. 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.
