S
M
T
W
T
F
S
26
92°
80°
27
92°
79°
28
91°
79°
29
91°
81°
30
90°
80°
31
93°
79°
1
91°
80°
2
92°
79°
3
91°
80°
4
92°
79°
5
91°
81°
6
92°
81°
7
92°
80°
8
91°
80°
9
92°
81°
10
91°
81°
11
92°
80°
12
91°
79°
13
92°
79°
14
91°
80°
15
91°
79°
16
92°
79°
17
91°
80°
18
92°
80°
19
92°
79°
20
91°
80°
21
90°
79°
22
91°
80°
23
91°
79°
24
92°
80°
25
92°
79°
26
92°
78°
27
91°
80°
28
Hist. Avg.
91°
79°
29
Hist. Avg.
91°
79°
30
Hist. Avg.
91°
79°
31
Hist. Avg.
91°
79°
1
Hist. Avg.
91°
79°
2
Hist. Avg.
91°
79°
3
Hist. Avg.
91°
79°
4
Hist. Avg.
91°
79°
5
Hist. Avg.
91°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Marathon
Marathon's August 2026 forecast shows daily high temperatures ranging from 90° to 93°, with overnight lows between 78° and 81°. 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.
