S
M
T
W
T
F
S
26
87°
66°
27
88°
67°
28
88°
67°
29
85°
66°
30
84°
66°
31
88°
67°
1
89°
66°
2
89°
67°
3
88°
65°
4
89°
66°
5
88°
66°
6
83°
65°
7
86°
60°
8
83°
61°
9
83°
60°
10
84°
60°
11
83°
65°
12
87°
65°
13
88°
64°
14
88°
59°
15
83°
59°
16
82°
64°
17
83°
64°
18
84°
59°
19
84°
58°
20
82°
58°
21
84°
59°
22
85°
58°
23
85°
58°
24
84°
57°
25
85°
58°
26
84°
62°
27
86°
63°
28
85°
62°
29
86°
64°
30
86°
62°
31
84°
55°
1
82°
54°
2
79°
56°
3
79°
55°
4
80°
55°
5
79°
56°
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 79° to 89°, with overnight lows between 54° and 67°. The average high for August is 85° with an average low of 62°. 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.
