S
M
T
W
T
F
S
26
89°
60°
27
90°
59°
28
90°
64°
29
84°
63°
30
85°
61°
1
64°
48°
2
69°
44°
3
80°
51°
4
87°
62°
5
83°
63°
6
81°
59°
7
70°
51°
8
81°
49°
9
89°
51°
10
92°
60°
11
78°
54°
12
92°
54°
13
93°
62°
14
89°
66°
15
91°
60°
16
93°
63°
17
93°
65°
18
92°
61°
19
85°
58°
20
84°
59°
21
82°
58°
22
78°
57°
23
77°
56°
24
85°
59°
25
85°
60°
26
84°
61°
27
87°
56°
28
89°
61°
29
90°
61°
30
90°
62°
31
85°
61°
1
82°
59°
2
82°
57°
3
83°
59°
4
83°
60°
5
84°
61°
6
88°
62°
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 77° to 93°, with overnight lows between 56° and 66°. The average high for May is 86° with an average low of 60°. 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.
