S
M
T
W
T
F
S
29
52°
37°
30
50°
39°
31
59°
46°
1
57°
34°
2
50°
30°
3
50°
37°
4
50°
34°
5
45°
34°
6
55°
34°
7
57°
32°
8
61°
46°
9
54°
39°
10
52°
36°
11
50°
39°
12
54°
39°
13
54°
34°
14
59°
28°
15
59°
50°
16
59°
45°
17
59°
48°
18
57°
37°
19
55°
34°
20
52°
37°
21
57°
35°
22
56°
35°
23
63°
38°
24
66°
40°
25
62°
41°
26
60°
44°
27
57°
44°
28
59°
43°
29
59°
41°
30
57°
40°
1
56°
39°
2
55°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Thornhill
Thornhill's April 2026 forecast shows daily high temperatures ranging from 52° to 66°, with overnight lows between 35° and 44°. The average high for April is 58° with an average low of 40°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Thornhill. See also: May | June | July.
