S
M
T
W
T
F
S
30
92°
71°
31
95°
70°
1
89°
69°
2
93°
68°
3
94°
72°
4
92°
70°
5
94°
69°
6
89°
64°
7
90°
64°
8
92°
67°
9
92°
70°
10
89°
70°
11
95°
69°
12
96°
72°
13
94°
69°
14
92°
68°
15
94°
69°
16
91°
65°
17
90°
64°
18
93°
66°
19
93°
68°
20
88°
65°
21
92°
64°
22
86°
64°
23
76°
64°
24
83°
62°
25
82°
65°
26
90°
67°
27
90°
64°
28
91°
60°
29
85°
65°
30
84°
66°
1
77°
57°
2
65°
58°
3
71°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Marathon
Marathon's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
