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
62°
36°
5
69°
38°
6
69°
35°
7
71°
46°
8
74°
43°
9
70°
43°
10
66°
45°
11
69°
47°
12
67°
44°
13
71°
44°
14
70°
44°
15
68°
41°
16
68°
46°
17
64°
35°
18
67°
40°
19
66°
39°
20
67°
33°
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 47°. The average high for April is 65° with an average low of 41°. 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.
