Click on a day for an hourly weather forecast
The temperatures in Marathon during September are extremely high, between 28°C and hot as 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Marathon. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Marathon in September 2025.
If you’re planning to visit Marathon in the near future, we highly recommend that you review the 14 day weather forecast for Marathon before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 23° / 20° | 3 | 28 | 0 | 35 mm | Perfect | Marathon in January |
| February | 23° / 21° | 2 | 26 | 0 | 33 mm | Perfect | Marathon in February |
| March | 24° / 22° | 2 | 29 | 0 | 23 mm | Perfect | Marathon in March |
| April | 25° / 24° | 3 | 27 | 0 | 42 mm | Perfect | Marathon in April |
| May | 27° / 26° | 6 | 25 | 0 | 93 mm | Perfect | Marathon in May |
| June | 29° / 27° | 10 | 20 | 0 | 110 mm | Ok | Marathon in June |
| July | 29° / 28° | 11 | 20 | 0 | 84 mm | Ok | Marathon in July |
| August | 30° / 28° | 12 | 19 | 0 | 110 mm | Ok | Marathon in August |
| September | 29° / 28° | 12 | 18 | 0 | 153 mm | Ok | Marathon in September |
| October | 28° / 26° | 7 | 24 | 0 | 133 mm | Good | Marathon in October |
| November | 25° / 24° | 4 | 27 | 0 | 47 mm | Perfect | Marathon in November |
| December | 24° / 22° | 2 | 29 | 0 | 38 mm | Perfect | Marathon in December |