S
M
T
W
T
F
S
26
88°
72°
27
87°
72°
28
85°
71°
29
86°
71°
30
87°
70°
31
87°
67°
1
86°
66°
2
86°
70°
3
87°
71°
4
86°
71°
5
86°
69°
6
87°
71°
7
89°
71°
8
85°
70°
9
87°
71°
10
89°
70°
11
87°
69°
12
86°
70°
13
87°
67°
14
86°
68°
15
90°
69°
16
90°
69°
17
89°
70°
18
90°
70°
19
88°
65°
20
86°
64°
21
84°
64°
22
84°
65°
23
85°
64°
24
84°
64°
25
84°
65°
26
85°
64°
27
84°
64°
28
84°
65°
29
88°
64°
30
88°
64°
31
87°
65°
1
87°
66°
2
88°
64°
3
84°
63°
4
83°
64°
5
83°
63°
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 83° to 90°, with overnight lows between 63° and 72°. The average high for August is 86° with an average low of 67°. 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.
