S
M
T
W
T
F
S
26
54°
40°
27
56°
43°
28
54°
41°
29
56°
41°
30
51°
40°
1
51°
40°
2
54°
40°
3
55°
38°
4
60°
41°
5
58°
41°
6
59°
42°
7
62°
40°
8
57°
40°
9
58°
47°
10
63°
48°
11
60°
48°
12
64°
47°
13
68°
47°
14
66°
44°
15
60°
42°
16
63°
45°
17
66°
50°
18
72°
51°
19
71°
40°
20
60°
40°
21
61°
41°
22
62°
42°
23
63°
48°
24
69°
53°
25
73°
53°
26
72°
52°
27
66°
52°
28
66°
51°
29
67°
49°
30
66°
53°
31
74°
53°
1
68°
51°
2
68°
46°
3
70°
47°
4
71°
46°
5
74°
48°
6
77°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Ancaster
Ancaster's May 2026 forecast shows daily high temperatures ranging from 51° to 77°, with overnight lows between 38° and 53°. The average high for May is 63° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Ancaster. See also: June | July | August.
