S
M
T
W
T
F
S
26
59°
34°
27
70°
34°
28
61°
48°
29
55°
45°
30
48°
34°
1
50°
28°
2
46°
36°
3
54°
34°
4
70°
41°
5
72°
46°
6
55°
40°
7
52°
36°
8
52°
39°
9
58°
43°
10
66°
43°
11
50°
35°
12
54°
37°
13
57°
45°
14
62°
44°
15
65°
47°
16
63°
44°
17
62°
43°
18
61°
44°
19
66°
45°
20
62°
40°
21
61°
41°
22
63°
41°
23
64°
43°
24
64°
42°
25
65°
47°
26
68°
48°
27
65°
45°
28
66°
43°
29
65°
43°
30
68°
48°
31
74°
52°
1
72°
50°
2
69°
46°
3
71°
51°
4
76°
54°
5
76°
55°
6
75°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Marathon
Marathon's May 2026 forecast shows daily high temperatures ranging from 50° to 76°, with overnight lows between 35° and 55°. The average high for May is 64° with an average low of 45°. 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 Marathon. See also: June | July | August.
