S
M
T
W
T
F
S
26
69°
41°
27
63°
42°
28
55°
34°
29
59°
37°
30
54°
33°
1
53°
29°
2
67°
25°
3
73°
44°
4
69°
40°
5
55°
28°
6
55°
23°
7
65°
31°
8
77°
33°
9
65°
31°
10
70°
29°
11
76°
26°
12
77°
48°
13
77°
38°
14
79°
55°
15
91°
55°
16
85°
62°
17
84°
65°
18
77°
51°
19
66°
44°
20
66°
44°
21
64°
47°
22
70°
50°
23
76°
54°
24
76°
55°
25
75°
56°
26
78°
54°
27
75°
53°
28
69°
52°
29
68°
52°
30
69°
51°
31
72°
52°
1
70°
49°
2
71°
56°
3
73°
60°
4
80°
62°
5
82°
62°
6
80°
61°
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 64° to 91°, with overnight lows between 44° and 65°. The average high for May is 75° with an average low of 54°. 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.
