S
M
T
W
T
F
S
26
86°
59°
27
86°
64°
28
81°
64°
29
81°
64°
30
81°
66°
31
86°
63°
1
86°
64°
2
84°
73°
3
84°
58°
4
86°
61°
5
83°
70°
6
87°
69°
7
85°
70°
8
87°
69°
9
86°
68°
10
90°
67°
11
87°
65°
12
84°
66°
13
82°
62°
14
81°
62°
15
85°
61°
16
84°
63°
17
87°
63°
18
84°
60°
19
84°
66°
20
85°
63°
21
83°
59°
22
83°
64°
23
87°
66°
24
88°
67°
25
87°
66°
26
85°
65°
27
80°
65°
28
80°
64°
29
83°
63°
30
84°
64°
31
84°
64°
1
85°
60°
2
77°
56°
3
76°
56°
4
76°
57°
5
77°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Allentown
Allentown's August 2026 forecast shows daily high temperatures ranging from 76° to 90°, with overnight lows between 55° and 70°. The average high for August is 84° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Allentown. See also: September | October | November.
