S
M
T
W
T
F
S
26
85°
63°
27
85°
63°
28
84°
62°
29
84°
61°
30
80°
56°
31
75°
55°
1
75°
55°
2
76°
56°
3
76°
60°
4
77°
58°
5
79°
57°
6
80°
62°
7
80°
61°
8
78°
59°
9
77°
59°
10
78°
53°
11
77°
55°
12
81°
57°
13
83°
61°
14
84°
62°
15
82°
57°
16
78°
62°
17
84°
61°
18
82°
54°
19
76°
53°
20
74°
52°
21
74°
52°
22
75°
53°
23
75°
52°
24
76°
52°
25
78°
53°
26
79°
52°
27
81°
55°
28
79°
53°
29
74°
56°
30
73°
51°
31
77°
54°
1
80°
49°
2
73°
48°
3
72°
49°
4
74°
56°
5
77°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Marathon
Marathon's August 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 48° and 63°. The average high for August is 78° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Marathon. See also: September | October | November.
