S
M
T
W
T
F
S
26
84°
64°
27
87°
68°
28
89°
71°
29
84°
69°
30
85°
68°
31
88°
65°
1
87°
65°
2
81°
74°
3
89°
74°
4
87°
70°
5
87°
73°
6
91°
71°
7
91°
69°
8
91°
69°
9
91°
70°
10
92°
69°
11
87°
69°
12
86°
72°
13
89°
69°
14
83°
74°
15
87°
71°
16
80°
72°
17
91°
72°
18
87°
69°
19
89°
62°
20
89°
68°
21
82°
65°
22
80°
66°
23
84°
63°
24
82°
57°
25
82°
59°
26
87°
68°
27
83°
67°
28
84°
67°
29
83°
65°
30
86°
63°
31
81°
62°
1
80°
62°
2
79°
61°
3
80°
59°
4
81°
61°
5
79°
59°
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 79° to 87°, with overnight lows between 57° and 68°. The average high for August is 82° 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.
