S
M
T
W
T
F
S
26
85°
64°
27
91°
65°
28
89°
69°
29
87°
68°
30
89°
64°
31
92°
63°
1
90°
62°
2
82°
73°
3
91°
73°
4
88°
70°
5
86°
72°
6
92°
72°
7
90°
70°
8
92°
71°
9
94°
67°
10
96°
73°
11
96°
73°
12
87°
71°
13
86°
69°
14
87°
67°
15
86°
65°
16
85°
65°
17
84°
67°
18
84°
66°
19
88°
70°
20
89°
69°
21
87°
68°
22
87°
69°
23
89°
70°
24
89°
70°
25
88°
69°
26
86°
69°
27
82°
68°
28
85°
69°
29
85°
67°
30
84°
68°
31
84°
67°
1
86°
65°
2
78°
60°
3
77°
61°
4
77°
62°
5
78°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Manassas
Manassas's August 2026 forecast shows daily high temperatures ranging from 77° to 96°, with overnight lows between 59° and 73°. The average high for August is 86° with an average low of 68°. 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 Manassas. See also: September | October | November.
