S
M
T
W
T
F
S
29
44°
25°
30
30°
22°
31
29°
13°
1
33°
8°
2
36°
29°
3
40°
31°
4
45°
30°
5
41°
22°
6
31°
17°
7
33°
21°
8
42°
29°
9
41°
26°
10
49°
30°
11
48°
32°
12
47°
36°
13
40°
32°
14
51°
32°
15
68°
29°
16
30°
21°
17
31°
20°
18
40°
18°
19
40°
21°
20
66°
30°
21
70°
41°
22
74°
55°
23
72°
34°
24
53°
31°
25
51°
29°
26
49°
34°
27
52°
33°
28
50°
34°
29
53°
35°
30
53°
34°
1
56°
33°
2
54°
35°
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 74°, with overnight lows between 29° and 55°. The average high for April is 57° with an average low of 36°. 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.
