S
M
T
W
T
F
S
29
57°
27°
30
72°
41°
31
81°
61°
1
79°
52°
2
52°
41°
3
63°
41°
4
79°
43°
5
55°
43°
6
54°
39°
7
50°
32°
8
52°
28°
9
61°
30°
10
72°
41°
11
63°
46°
12
64°
37°
13
79°
50°
14
84°
57°
15
88°
59°
16
90°
64°
17
79°
63°
18
75°
49°
19
56°
36°
20
51°
30°
21
55°
41°
22
68°
44°
23
72°
45°
24
75°
48°
25
70°
50°
26
61°
46°
27
65°
47°
28
61°
45°
29
60°
44°
30
60°
43°
1
63°
45°
2
63°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Allentown
Allentown's April 2026 forecast shows daily high temperatures ranging from 51° to 75°, with overnight lows between 30° and 50°. The average high for April is 64° with an average low of 44°. 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 Allentown. See also: May | June | July.
