S
M
T
W
T
F
S
26
46°
32°
27
67°
33°
28
51°
32°
29
43°
29°
30
41°
30°
1
42°
26°
2
43°
22°
3
46°
30°
4
49°
30°
5
41°
32°
6
39°
32°
7
40°
31°
8
47°
31°
9
49°
34°
10
46°
33°
11
45°
25°
12
46°
24°
13
63°
33°
14
57°
32°
15
63°
38°
16
55°
38°
17
65°
33°
18
52°
40°
19
49°
30°
20
43°
28°
21
48°
26°
22
61°
29°
23
N/A
24
46°
39°
25
58°
45°
26
65°
44°
27
70°
41°
28
67°
43°
29
65°
40°
30
64°
39°
31
61°
43°
1
62°
43°
2
61°
48°
3
60°
46°
4
59°
45°
5
58°
44°
6
57°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Marathon
Marathon's May 2026 forecast shows daily high temperatures ranging from 46° to 70°, with overnight lows between 39° and 48°. The average high for May is 61° with an average low of 43°. 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.
