Marathon weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Marathon in September?
In September, Marathon is hot: daytime highs average 29 °C, and nights cool down to about 19 °C. The sea averages 24.3 °C – pleasant for swimming. The sun shines for around 9 hours a day. Rain is rare: about 3 days bring 17 mm in total. On about 11 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Marathon.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 90 | 99 | 74 |
| Day | 33° | 29° | 23° |
| Night | 22° | 19° | 15° |
| Sea | 25° | 24° | 22° |
| Sun | 11 h | 9 h | 7 h |
| Rain days | 1 | 3 | 4 |
More details for September
- Daylight
- 12 h 30 min07:05 – 19:34
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 22 %on averageAll months
- Hot days
- 11 days30 °C or moreAll months
- Time zone
- UTC+3Europe/Athens
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %93 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
Marathon in September: quick answers
Is Marathon hot in September?
Yes. In September, Marathon is hot: daytime highs average 29 °C and nights stay around 19 °C. On about 11 days the thermometer climbs to 30 °C or more.
Can you swim in Marathon in September?
Yes. In September the sea averages 24.3 °C – pleasant for swimming.
Does it rain much in Marathon in September?
Rain is rare: about 3 days bring 17 mm in total.
Marathon month by month
The whole year in MarathonAll destinations: GreeceWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences