S
M
T
W
T
F
S
26
N/A
27
N/A
28
N/A
29
N/A
30
N/A
1
N/A
2
N/A
3
N/A
4
N/A
5
N/A
6
N/A
7
N/A
8
N/A
9
N/A
10
N/A
11
N/A
12
N/A
13
N/A
14
N/A
15
N/A
16
N/A
17
N/A
18
N/A
19
N/A
20
N/A
21
N/A
22
N/A
23
79°
57°
24
84°
58°
25
87°
62°
26
84°
62°
27
78°
65°
28
79°
64°
29
81°
63°
30
83°
63°
31
79°
58°
1
76°
59°
2
81°
59°
3
80°
59°
4
82°
61°
5
85°
64°
6
87°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fairfax
Fairfax's May 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 57° and 68°. The average high for May is 82° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Fairfax. See also: June | July | August.
