S
M
T
W
T
F
S
29
81°
53°
30
84°
67°
31
84°
69°
1
79°
68°
2
86°
65°
3
79°
55°
4
65°
45°
5
69°
40°
6
72°
40°
7
74°
42°
8
77°
53°
9
82°
58°
10
77°
59°
11
81°
64°
12
72°
67°
13
82°
66°
14
77°
55°
15
72°
53°
16
71°
56°
17
77°
63°
18
77°
61°
19
79°
64°
20
81°
62°
21
73°
51°
22
67°
57°
23
77°
58°
24
78°
57°
25
75°
57°
26
74°
58°
27
75°
59°
28
78°
59°
29
77°
58°
30
74°
59°
1
77°
59°
2
70°
55°
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 67° to 82°, with overnight lows between 51° and 67°. The average high for April is 76° with an average low of 59°. 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.
