S
M
T
W
T
F
S
29
54°
25°
30
63°
43°
31
69°
56°
1
58°
36°
2
70°
37°
3
73°
48°
4
78°
43°
5
56°
31°
6
41°
28°
7
34°
16°
8
55°
14°
9
70°
38°
10
66°
39°
11
46°
34°
12
71°
33°
13
72°
58°
14
73°
56°
15
74°
61°
16
74°
50°
17
67°
52°
18
77°
37°
19
43°
26°
20
43°
30°
21
56°
43°
22
58°
40°
23
59°
41°
24
55°
43°
25
59°
42°
26
58°
45°
27
54°
41°
28
55°
37°
29
56°
40°
30
57°
41°
1
57°
39°
2
58°
40°
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 43° to 77°, with overnight lows between 26° and 61°. The average high for April is 59° 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.
