S
M
T
W
T
F
S
29
38°
21°
30
39°
26°
31
46°
26°
1
50°
33°
2
52°
23°
3
46°
36°
4
47°
36°
5
44°
36°
6
45°
36°
7
47°
35°
8
51°
30°
9
55°
34°
10
57°
36°
11
56°
36°
12
57°
36°
13
50°
38°
14
49°
32°
15
51°
34°
16
52°
35°
17
58°
36°
18
56°
36°
19
56°
37°
20
57°
38°
21
59°
36°
22
49°
33°
23
50°
34°
24
50°
33°
25
51°
34°
26
54°
35°
27
52°
35°
28
53°
37°
29
51°
38°
30
50°
36°
1
51°
36°
2
52°
40°
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 49° to 59°, with overnight lows between 30° and 40°. The average high for April is 53° with an average low of 35°. 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.
