S
M
T
W
T
F
S
26
83°
66°
27
80°
61°
28
79°
61°
29
80°
64°
30
83°
65°
31
80°
63°
1
85°
67°
2
85°
63°
3
80°
62°
4
79°
61°
5
80°
62°
6
80°
63°
7
81°
62°
8
78°
61°
9
82°
66°
10
85°
65°
11
79°
66°
12
84°
67°
13
84°
67°
14
82°
66°
15
84°
66°
16
85°
60°
17
78°
61°
18
79°
65°
19
78°
61°
20
77°
58°
21
76°
59°
22
78°
59°
23
83°
62°
24
84°
65°
25
85°
64°
26
84°
58°
27
77°
57°
28
76°
57°
29
76°
58°
30
81°
63°
31
82°
64°
1
82°
64°
2
81°
61°
3
76°
61°
4
81°
63°
5
77°
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 76° to 85°, with overnight lows between 57° and 67°. The average high for August is 81° 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.
