S
M
T
W
T
F
S
30
69°
48°
31
69°
49°
1
70°
47°
2
68°
52°
3
69°
54°
4
72°
47°
5
69°
46°
6
68°
53°
7
71°
55°
8
69°
54°
9
75°
53°
10
73°
51°
11
67°
52°
12
67°
52°
13
Hist. Avg.
68°
49°
14
Hist. Avg.
67°
49°
15
Hist. Avg.
67°
48°
16
Hist. Avg.
67°
48°
17
Hist. Avg.
66°
48°
18
Hist. Avg.
66°
47°
19
Hist. Avg.
65°
47°
20
Hist. Avg.
65°
47°
21
Hist. Avg.
65°
46°
22
Hist. Avg.
64°
46°
23
Hist. Avg.
64°
46°
24
Hist. Avg.
63°
45°
25
Hist. Avg.
63°
45°
26
Hist. Avg.
63°
44°
27
Hist. Avg.
62°
44°
28
Hist. Avg.
62°
44°
29
Hist. Avg.
61°
43°
30
Hist. Avg.
61°
43°
1
Hist. Avg.
61°
43°
2
Hist. Avg.
60°
42°
3
Hist. Avg.
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Marathon
Marathon's September 2026 forecast shows daily high temperatures ranging from 67° to 75°, with overnight lows between 46° and 55°. The average high for September is 70° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Marathon. See also: October | November | December.
