Spring
March – MayMild weather with daytime temperatures of 18–25 °C. Nature is green, making it ideal for visiting places such as Gilindire Cave, Silifke and Kızkalesi. The sea starts to warm up towards the end of May.
Things to do nearby
Season guide
Mersin weather and sea temperature: a month-by-month guide
Planning your holiday? See what the weather and the sea are like each month, with averages calculated for Yanışlı Bay, where our hotel is located.
In short
In Yanışlı Bay the sea averages 26–30 °C from June to October; August is the warmest month (about 30 °C). In May it is about 22 °C and in November about 24 °C. In July and August daytime temperatures average 32 °C, with only about 1 rainy day a month. January is the wettest month.
- Warmest sea
- August, ~30 °C
- Sea above 25 °C
- June – October
- Hottest weather
- July – August, ~32 °C
- Wettest month
- January
Monthly averages
| Month | High | Low | Sea water | Rainy days |
|---|---|---|---|---|
| January | 15 °C | 9 °C | 11 | |
| February | 16 °C | 9 °C | 6 | |
| March | 18 °C | 11 °C | 7 | |
| April | 21 °C | 14 °C | 5 | |
| May | 25 °C | 18 °C | 5 | |
| June | 29 °C | 22 °C | 2 | |
| July | 32 °C | 25 °C | 1 | |
| August | 32 °C | 26 °C | 1 | |
| September | 31 °C | 23 °C | 2 | |
| October | 27 °C | 20 °C | 3 | |
| November | 22 °C | 15 °C | 6 | |
| December | 17 °C | 11 °C | 9 |
Air: Open-Meteo, ERA5 reanalysis data (2015–2025 average). Sea water: Open-Meteo Marine (2022–2025 average). Rainy days: days with at least 1 mm of rain. Values are calculated for the hotel's location and vary from year to year.
Season by season
Summer
June – AugustThe warmest sea and the most settled weather of the year. The sea is 26–30 °C and there is hardly any rain. The best months for a beach, pool and aquapark holiday.
Pools & beachAutumn
September – NovemberThe sea keeps its summer warmth: about 29 °C in September and 27 °C in October. The air turns milder, a lovely time for both swimming and sightseeing.
Pools & beachWinter
December – FebruaryThanks to the Mediterranean climate, winters are mild, with daytime temperatures around 15–17 °C. Most rainy days fall in this season.
Things to do nearbyWeather in Yanışlı now
- Air
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- Sea water
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- Wind
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Questions about this page
When does the sea warm up in Mersin?
In Yanışlı, Gülnar, the sea averages 22 °C in May and 26 °C in June. From June to October it averages 26–30 °C.
What is the sea temperature in Mersin in August?
August is the warmest month for the sea; in Yanışlı Bay the water averages about 30 °C.
Can you swim in Mersin in October and November?
Yes. The sea averages about 27 °C in October and around 24 °C in November. In October daytime air temperatures are about 27 °C.
Which is the wettest month in Mersin?
January is the wettest month, with about 11 days of at least 1 mm of rain on average. There is very little rain from June to September.
What is the best month for a holiday in Mersin?
June to September for the sea and beach, September to October for both swimming and sightseeing, and April to May for nature and excursions.
Summer is waiting for you at Ulu
Choose your dates and book the room that suits you best through our official booking system, or give us a call.