S
M
T
W
T
F
S
26
85°
69°
27
83°
68°
28
82°
66°
29
82°
68°
30
84°
69°
31
87°
69°
1
85°
68°
2
84°
67°
3
90°
68°
4
85°
66°
5
83°
66°
6
84°
64°
7
83°
61°
8
82°
62°
9
83°
60°
10
83°
61°
11
85°
68°
12
89°
69°
13
89°
66°
14
88°
61°
15
83°
66°
16
83°
67°
17
84°
60°
18
83°
62°
19
83°
61°
20
84°
61°
21
85°
66°
22
88°
66°
23
89°
64°
24
88°
66°
25
89°
65°
26
90°
66°
27
89°
65°
28
87°
66°
29
88°
65°
30
86°
59°
31
83°
56°
1
80°
56°
2
79°
57°
3
79°
57°
4
80°
58°
5
80°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Fairfax
Fairfax's August 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 56° and 69°. The average high for August is 85° with an average low of 64°. 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 Fairfax. See also: September | October | November.
