S
M
T
W
T
F
S
29
63°
34°
30
78°
35°
31
69°
39°
1
41°
32°
2
56°
37°
3
51°
38°
4
46°
31°
5
51°
34°
6
44°
23°
7
43°
34°
8
62°
39°
9
48°
35°
10
49°
39°
11
51°
43°
12
59°
42°
13
60°
39°
14
56°
35°
15
56°
38°
16
57°
35°
17
50°
37°
18
61°
40°
19
63°
44°
20
65°
46°
21
66°
46°
22
66°
45°
23
65°
47°
24
66°
44°
25
64°
40°
26
55°
33°
27
52°
33°
28
56°
41°
29
57°
39°
30
56°
38°
1
61°
42°
2
64°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Waterloo
Waterloo's April 2026 forecast shows daily high temperatures ranging from 43° to 66°, with overnight lows between 23° and 47°. The average high for April is 57° with an average low of 39°. 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 Waterloo. See also: May | June | July.
