S
M
T
W
T
F
S
29
52°
39°
30
50°
39°
31
55°
46°
1
52°
30°
2
48°
28°
3
48°
37°
4
48°
36°
5
46°
34°
6
55°
32°
7
68°
34°
8
57°
46°
9
50°
41°
10
48°
39°
11
48°
40°
12
48°
35°
13
45°
31°
14
55°
42°
15
55°
43°
16
55°
41°
17
55°
41°
18
56°
39°
19
57°
41°
20
55°
39°
21
56°
39°
22
54°
38°
23
49°
38°
24
49°
37°
25
50°
39°
26
50°
38°
27
51°
37°
28
50°
37°
29
50°
41°
30
51°
43°
1
52°
42°
2
51°
38°
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 45° to 57°, with overnight lows between 31° and 43°. The average high for April is 52° with an average low of 39°. 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.
