S
M
T
W
T
F
S
26
90°
81°
27
91°
82°
28
92°
82°
29
91°
81°
30
90°
82°
31
90°
83°
1
92°
82°
2
90°
82°
3
91°
81°
4
91°
82°
5
92°
82°
6
89°
81°
7
90°
82°
8
90°
82°
9
91°
81°
10
90°
82°
11
91°
82°
12
92°
81°
13
91°
80°
14
92°
79°
15
93°
81°
16
92°
80°
17
93°
79°
18
92°
79°
19
91°
80°
20
92°
79°
21
92°
80°
22
93°
78°
23
94°
79°
24
92°
80°
25
91°
81°
26
92°
80°
27
92°
79°
28
91°
80°
29
91°
80°
30
90°
79°
31
90°
80°
1
92°
79°
2
89°
77°
3
91°
80°
4
91°
78°
5
92°
80°
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 89° to 94°, with overnight lows between 77° and 83°. The average high for August is 91° with an average low of 80°. 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.
