S
M
T
W
T
F
S
29
62°
24°
30
72°
47°
31
80°
47°
1
85°
55°
2
84°
53°
3
82°
55°
4
82°
60°
5
73°
51°
6
67°
43°
7
65°
35°
8
58°
33°
9
66°
27°
10
78°
30°
11
81°
53°
12
79°
58°
13
83°
54°
14
88°
56°
15
92°
62°
16
89°
60°
17
87°
59°
18
89°
62°
19
83°
46°
20
73°
44°
21
77°
50°
22
78°
54°
23
78°
55°
24
77°
43°
25
66°
44°
26
67°
44°
27
68°
41°
28
70°
47°
29
73°
48°
30
77°
49°
1
71°
44°
2
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Collinsville
Collinsville's April 2026 forecast shows daily high temperatures ranging from 66° to 92°, with overnight lows between 41° and 62°. The average high for April is 78° with an average low of 51°. 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 Collinsville. See also: May | June | July.
