S
M
T
W
T
F
S
26
78°
57°
27
83°
61°
28
84°
61°
29
86°
59°
30
78°
56°
31
84°
57°
1
80°
56°
2
76°
56°
3
78°
55°
4
78°
55°
5
79°
56°
6
78°
57°
7
79°
60°
8
82°
63°
9
78°
59°
10
77°
62°
11
84°
63°
12
84°
63°
13
82°
55°
14
77°
53°
15
74°
53°
16
76°
59°
17
75°
57°
18
75°
53°
19
76°
55°
20
76°
63°
21
78°
62°
22
83°
62°
23
84°
61°
24
83°
53°
25
82°
52°
26
74°
57°
27
73°
60°
28
74°
60°
29
79°
59°
30
81°
59°
31
81°
56°
1
80°
53°
2
77°
56°
3
79°
52°
4
77°
53°
5
79°
56°
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 73° to 86°, with overnight lows between 52° and 63°. The average high for August is 79° with an average low of 58°. 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.
