S
M
T
W
T
F
S
26
86°
71°
27
88°
70°
28
85°
70°
29
87°
69°
30
76°
65°
1
70°
56°
2
71°
54°
3
78°
49°
4
79°
53°
5
84°
59°
6
88°
70°
7
80°
66°
8
78°
65°
9
73°
63°
10
84°
65°
11
80°
65°
12
85°
66°
13
87°
65°
14
90°
63°
15
87°
66°
16
87°
68°
17
89°
67°
18
90°
72°
19
90°
73°
20
88°
67°
21
82°
69°
22
91°
72°
23
74°
68°
24
78°
68°
25
78°
72°
26
83°
73°
27
86°
74°
28
81°
72°
29
81°
70°
30
84°
72°
31
86°
73°
1
85°
71°
2
86°
68°
3
84°
70°
4
86°
69°
5
85°
73°
6
89°
74°
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 78° to 89°, with overnight lows between 68° and 74°. The average high for May is 84° with an average low of 72°. 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.
