S
M
T
W
T
F
S
29
30°
26°
30
73°
63°
31
82°
62°
1
83°
61°
2
54°
42°
3
73°
42°
4
79°
46°
5
76°
46°
6
57°
41°
7
56°
39°
8
51°
26°
9
58°
34°
10
71°
51°
11
66°
37°
12
64°
50°
13
79°
60°
14
84°
59°
15
86°
59°
16
78°
53°
17
71°
49°
18
70°
45°
19
66°
50°
20
69°
49°
21
68°
46°
22
67°
41°
23
60°
39°
24
61°
46°
25
60°
44°
26
59°
44°
27
61°
41°
28
61°
42°
29
62°
39°
30
61°
40°
1
64°
49°
2
72°
49°
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 58° to 86°, with overnight lows between 34° and 60°. The average high for April is 67° with an average low of 47°. 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.
