S
M
T
W
T
F
S
26
93°
72°
27
91°
77°
28
90°
72°
29
90°
69°
30
84°
70°
31
70°
63°
1
82°
63°
2
82°
59°
3
84°
66°
4
73°
59°
5
77°
54°
6
81°
54°
7
75°
57°
8
79°
54°
9
84°
64°
10
81°
66°
11
84°
70°
12
84°
72°
13
79°
70°
14
79°
66°
15
82°
72°
16
79°
61°
17
82°
55°
18
82°
63°
19
79°
59°
20
81°
57°
21
79°
63°
22
79°
55°
23
79°
48°
24
82°
59°
25
88°
63°
26
79°
61°
27
77°
49°
28
82°
64°
29
82°
66°
30
86°
66°
31
84°
57°
1
81°
62°
2
84°
65°
3
81°
66°
4
84°
64°
5
87°
62°
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 77° to 87°, with overnight lows between 49° and 66°. The average high for August is 83° with an average low of 62°. 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.
