S
M
T
W
T
F
S
26
81°
65°
27
82°
65°
28
86°
64°
29
87°
66°
30
87°
65°
31
86°
65°
1
86°
64°
2
83°
64°
3
84°
63°
4
87°
65°
5
87°
64°
6
86°
65°
7
87°
61°
8
88°
61°
9
85°
62°
10
87°
59°
11
84°
60°
12
85°
59°
13
88°
63°
14
88°
64°
15
87°
63°
16
82°
63°
17
82°
58°
18
83°
63°
19
87°
63°
20
82°
62°
21
86°
63°
22
81°
59°
23
84°
57°
24
86°
58°
25
87°
62°
26
87°
62°
27
86°
59°
28
81°
57°
29
84°
58°
30
83°
59°
31
84°
60°
1
80°
59°
2
79°
56°
3
79°
55°
4
78°
53°
5
79°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Allegheny
Allegheny's August 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 53° and 66°. The average high for August is 84° with an average low of 61°. 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 Allegheny. See also: September | October | November.
