S
M
T
W
T
F
S
29
81°
54°
30
81°
54°
31
61°
41°
1
52°
37°
2
72°
37°
3
52°
36°
4
61°
34°
5
66°
36°
6
66°
39°
7
71°
49°
8
74°
44°
9
74°
41°
10
67°
45°
11
72°
50°
12
70°
49°
13
71°
38°
14
58°
40°
15
71°
45°
16
70°
46°
17
73°
47°
18
74°
45°
19
74°
46°
20
64°
35°
21
55°
31°
22
54°
30°
23
58°
37°
24
60°
39°
25
69°
41°
26
69°
42°
27
66°
42°
28
65°
44°
29
60°
43°
30
61°
43°
1
60°
44°
2
61°
43°
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 54° to 74°, with overnight lows between 30° and 50°. The average high for April is 66° 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.
