S
M
T
W
T
F
S
30
71°
52°
31
70°
54°
1
70°
54°
2
67°
53°
3
70°
52°
4
68°
50°
5
65°
49°
6
65°
53°
7
67°
50°
8
68°
51°
9
66°
52°
10
67°
48°
11
66°
48°
12
66°
49°
13
65°
50°
14
63°
51°
15
63°
47°
16
62°
46°
17
62°
45°
18
63°
46°
19
62°
47°
20
62°
46°
21
62°
46°
22
63°
47°
23
61°
48°
24
62°
46°
25
61°
47°
26
63°
50°
27
64°
51°
28
64°
50°
29
Hist. Avg.
59°
48°
30
Hist. Avg.
59°
48°
1
Hist. Avg.
58°
47°
2
Hist. Avg.
58°
47°
3
Hist. Avg.
58°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Ancaster
Ancaster's September 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 45° and 54°. The average high for September is 65° 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 Ancaster. See also: October | November | December.
