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
59°
26°
10
74°
40°
11
66°
37°
12
63°
48°
13
82°
60°
14
84°
59°
15
87°
62°
16
87°
60°
17
79°
53°
18
79°
56°
19
73°
47°
20
62°
42°
21
64°
48°
22
72°
50°
23
71°
50°
24
72°
42°
25
59°
38°
26
61°
44°
27
61°
39°
28
62°
44°
29
65°
42°
30
69°
41°
1
63°
40°
2
63°
39°
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 59° to 87°, with overnight lows between 37° and 62°. The average high for April is 70° 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.
