S
M
T
W
T
F
S
29
67°
56°
30
81°
54°
31
83°
59°
1
82°
64°
2
83°
62°
3
85°
64°
4
86°
67°
5
77°
61°
6
63°
51°
7
80°
46°
8
79°
47°
9
80°
54°
10
82°
53°
11
84°
54°
12
85°
57°
13
82°
53°
14
83°
58°
15
84°
61°
16
83°
58°
17
84°
59°
18
91°
64°
19
90°
63°
20
90°
60°
21
87°
62°
22
84°
63°
23
83°
64°
24
91°
67°
25
84°
63°
26
83°
62°
27
81°
62°
28
82°
63°
29
78°
63°
30
81°
64°
1
80°
63°
2
84°
64°
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 78° to 91°, with overnight lows between 53° and 67°. The average high for April is 84° with an average low of 61°. 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.
