Marathon weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Marathon in December?
In December, Marathon is cool: daytime highs average 14 °C, and nights cool down to about 7 °C. The sea averages 16.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 9 rainy days and 66 mm in total. All in all, December is not an ideal month for a holiday in Marathon.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 28 | 13 | 15 |
| Day | 18° | 14° | 12° |
| Night | 11° | 7° | 5° |
| Sea | 19° | 17° | 15° |
| Sun | 4 h | 3 h | 3 h |
| Rain days | 7 | 9 | 9 |
More details for December
- Daylight
- 9 h 32 min07:33 – 17:05
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 57 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+2Europe/Athens
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %64 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- A jumper for the evenings
- Rain jacket or umbrella
Marathon in December: quick answers
Is Marathon hot in December?
No. In December, Marathon is cool: daytime highs average 14 °C and nights drop to about 7 °C.
Can you swim in Marathon in December?
Only if you don't mind cold water: in December the sea averages just 16.6 °C. Comfortable swimming is possible from June to October.
Does it rain much in Marathon in December?
Rain is frequent, with about 9 rainy days and 66 mm in total.
Marathon month by month
The whole year in MarathonAll destinations: GreeceWhere to go in DecemberSea temperature in December
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