S
M
T
W
T
F
S
26
70°
34°
27
59°
43°
28
59°
48°
29
68°
46°
30
77°
43°
1
75°
46°
2
75°
51°
3
83°
52°
4
80°
49°
5
74°
47°
6
73°
45°
7
68°
43°
8
63°
45°
9
69°
44°
10
74°
46°
11
73°
48°
12
69°
45°
13
67°
44°
14
68°
44°
15
63°
43°
16
57°
48°
17
64°
43°
18
57°
42°
19
57°
40°
20
58°
40°
21
67°
47°
22
67°
45°
23
63°
43°
24
68°
49°
25
68°
46°
26
65°
44°
27
68°
49°
28
70°
50°
29
70°
49°
30
71°
50°
31
72°
51°
1
71°
50°
2
69°
49°
3
70°
49°
4
69°
46°
5
69°
46°
6
67°
44°
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 57° to 83°, with overnight lows between 40° and 52°. The average high for May is 68° with an average low of 46°. 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.
