Marathon weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Good
Best time to visit: June – September
What is the weather like in Marathon in May?
In May, Marathon is warm: daytime highs average 27 °C, and nights cool down to about 15 °C. The sea averages 18.0 °C – bracing, so a wetsuit helps for longer swims. With around 9 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 17 mm in total. On about 6 days the thermometer climbs to 30 °C or more. All in all, May is a good month for a holiday in Marathon.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 12 min06:14 – 20:26
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 33 %on averageAll months
- Hot days
- 6 days30 °C or moreAll months
- Time zone
- UTC+3Europe/Athens
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %14 %
- Sunshineweight 20 %100 %
- 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 May
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- A jumper for the evenings
Marathon in May: quick answers
Is Marathon hot in May?
Warm rather than hot: in May, daytime highs in Marathon average 27 °C and nights cool to about 15 °C. On about 6 days the thermometer climbs to 30 °C or more.
Can you swim in Marathon in May?
Only if you don't mind cold water: in May the sea averages just 18.0 °C. Comfortable swimming is possible from June to October.
Does it rain much in Marathon in May?
Rain is rare: about 4 days bring 17 mm in total.
Marathon month by month
The whole year in MarathonAll destinations: GreeceWhere to go in MaySea temperature in May
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