S
M
T
W
T
F
S
26
86°
71°
27
86°
70°
28
85°
69°
29
83°
70°
30
84°
66°
31
79°
64°
1
79°
64°
2
80°
67°
3
80°
69°
4
79°
67°
5
81°
65°
6
82°
69°
7
85°
70°
8
84°
69°
9
82°
68°
10
82°
63°
11
81°
62°
12
81°
63°
13
80°
68°
14
85°
69°
15
84°
68°
16
86°
70°
17
87°
69°
18
86°
66°
19
84°
61°
20
79°
61°
21
78°
62°
22
78°
60°
23
79°
60°
24
78°
61°
25
79°
60°
26
80°
60°
27
79°
61°
28
79°
61°
29
80°
60°
30
77°
60°
31
80°
63°
1
83°
59°
2
82°
58°
3
76°
57°
4
77°
58°
5
77°
64°
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 76° to 87°, with overnight lows between 57° and 71°. The average high for August is 81° 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.
