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
86°
73°
3
84°
66°
4
86°
59°
5
84°
68°
6
90°
73°
7
91°
70°
8
86°
70°
9
91°
63°
10
91°
70°
11
87°
65°
12
85°
66°
13
87°
66°
14
83°
59°
15
82°
59°
16
80°
62°
17
81°
63°
18
79°
63°
19
80°
62°
20
81°
64°
21
81°
63°
22
83°
62°
23
87°
66°
24
79°
60°
25
82°
62°
26
85°
63°
27
86°
65°
28
87°
63°
29
85°
59°
30
78°
57°
31
78°
57°
1
79°
61°
2
79°
60°
3
80°
60°
4
79°
63°
5
79°
63°
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 78° to 91°, with overnight lows between 57° and 70°. The average high for August is 83° 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.
