S
M
T
W
T
F
S
26
88°
62°
27
86°
63°
28
89°
61°
29
85°
61°
30
83°
67°
31
88°
62°
1
89°
61°
2
86°
66°
3
88°
62°
4
90°
61°
5
83°
65°
6
82°
60°
7
83°
59°
8
81°
59°
9
83°
60°
10
84°
60°
11
85°
61°
12
85°
63°
13
84°
63°
14
83°
61°
15
82°
66°
16
87°
64°
17
87°
63°
18
86°
58°
19
84°
58°
20
82°
59°
21
85°
63°
22
84°
62°
23
87°
64°
24
88°
65°
25
87°
64°
26
87°
62°
27
86°
58°
28
85°
58°
29
80°
62°
30
86°
62°
31
81°
56°
1
80°
57°
2
Hist. Avg.
81°
63°
3
Hist. Avg.
81°
62°
4
Hist. Avg.
81°
62°
5
Hist. Avg.
80°
62°
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 80° to 90°, with overnight lows between 56° 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.
