S
M
T
W
T
F
S
26
81°
63°
27
84°
63°
28
81°
61°
29
77°
60°
30
84°
64°
31
79°
59°
1
83°
64°
2
85°
62°
3
79°
57°
4
78°
56°
5
77°
58°
6
77°
57°
7
83°
57°
8
80°
56°
9
79°
56°
10
84°
62°
11
83°
56°
12
80°
59°
13
82°
65°
14
86°
65°
15
81°
60°
16
83°
54°
17
76°
54°
18
75°
55°
19
77°
55°
20
75°
56°
21
74°
55°
22
74°
61°
23
75°
63°
24
82°
62°
25
84°
54°
26
82°
51°
27
73°
52°
28
73°
52°
29
72°
54°
30
74°
60°
31
77°
62°
1
81°
61°
2
81°
58°
3
77°
52°
4
79°
58°
5
79°
51°
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 72° to 86°, with overnight lows between 51° and 65°. 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.
