S
M
T
W
T
F
S
26
85°
63°
27
78°
58°
28
68°
50°
29
66°
43°
30
68°
42°
1
69°
45°
2
70°
45°
3
86°
51°
4
83°
64°
5
69°
48°
6
65°
44°
7
76°
42°
8
85°
53°
9
86°
46°
10
70°
47°
11
79°
40°
12
85°
56°
13
82°
58°
14
90°
63°
15
89°
71°
16
90°
72°
17
89°
72°
18
92°
77°
19
76°
53°
20
62°
54°
21
65°
57°
22
80°
61°
23
77°
57°
24
84°
58°
25
87°
62°
26
84°
62°
27
78°
65°
28
79°
64°
29
81°
63°
30
80°
60°
31
75°
58°
1
76°
57°
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 75° to 87°, with overnight lows between 57° and 68°. The average high for May is 81° 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.
