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°
73°
16
78°
73°
17
90°
71°
18
87°
65°
19
87°
72°
20
85°
64°
21
78°
64°
22
76°
62°
23
77°
61°
24
83°
66°
25
86°
65°
26
86°
64°
27
85°
63°
28
83°
61°
29
78°
63°
30
83°
66°
31
75°
59°
1
76°
59°
2
76°
60°
3
75°
63°
4
75°
60°
5
76°
60°
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 75° to 90°, with overnight lows between 59° and 73°. 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.
