S
M
T
W
T
F
S
29
50°
36°
30
48°
37°
31
55°
45°
1
52°
41°
2
50°
34°
3
57°
39°
4
55°
37°
5
45°
37°
6
57°
34°
7
63°
36°
8
67°
48°
9
53°
37°
10
51°
43°
11
49°
38°
12
51°
37°
13
51°
38°
14
53°
38°
15
54°
41°
16
54°
42°
17
53°
43°
18
54°
43°
19
55°
41°
20
54°
42°
21
56°
45°
22
51°
42°
23
50°
39°
24
50°
39°
25
51°
40°
26
50°
40°
27
51°
41°
28
52°
40°
29
52°
46°
30
53°
46°
1
57°
47°
2
56°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Thornton
Thornton's April 2026 forecast shows daily high temperatures ranging from 49° to 67°, with overnight lows between 37° and 48°. The average high for April is 53° with an average low of 42°. 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 Thornton. See also: May | June | July.
