S
M
T
W
T
F
S
29
63°
35°
30
80°
47°
31
69°
39°
1
42°
37°
2
72°
39°
3
64°
38°
4
62°
39°
5
53°
37°
6
51°
33°
7
38°
30°
8
69°
36°
9
68°
50°
10
50°
34°
11
58°
30°
12
80°
55°
13
79°
63°
14
80°
56°
15
72°
59°
16
72°
47°
17
81°
46°
18
61°
38°
19
52°
31°
20
57°
45°
21
74°
51°
22
70°
56°
23
82°
60°
24
71°
48°
25
61°
47°
26
62°
49°
27
58°
45°
28
55°
43°
29
58°
43°
30
61°
46°
1
64°
45°
2
59°
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 55° to 82°, with overnight lows between 43° and 60°. The average high for April is 64° with an average low of 48°. 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.
