Marmaris weather by month

When to go to Marmaris

For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: June, July, August, September. December is the wettest month (174 mm, about 12 rainy days) and August the driest (2 mm). The sea is warmest in August at 26.9°C and coolest in March at 16.6°C.

Getting there

A direct flight from London Gatwick to Dalaman International Airport (DLM, 49 km from Marmaris) takes roughly 4 h 12 min - short-haul (up to 4.5 h) by UK standards. Time-zone: Europe/Istanbul.

Records and extremes, 1991-2020

The hottest day recorded in Marmaris between 1991 and 2020 reached 44.5°C on 1 July 2017; the coldest fell to -1.9°C on 6 January 2002. In July one day in ten tops 36.8°C and about 91% of days pass 30°C; in January one night in ten drops to 4.7°C or below. The wettest single month of the period was January 2019 with 419 mm, against a January average of 172 mm.

Winter and spring: mild afternoons, then a gradual warm-up

December, January and February are the least suitable months for a beach-led trip. January and February average 14°C by day and 8°C at night, so bring layers rather than relying on summer clothes. December and January each average 12 rain days; leave room to change outdoor plans. March lifts daytime temperatures to 17°C, but evenings remain cool. April reaches 20°C, making time outdoors more comfortable, although its 17°C sea will feel chilly for many swimmers. May is the clearer turning point: days average 25°C, nights 17°C and sunshine reaches 10 hours. It suits travellers who want warmth without midsummer heat, though the sea at 20°C is still cooler than later in the season. Keep a light layer handy for spring evenings and some rain protection in your bag.

Summer: reliable heat, with little relief after dark

June brings summer conditions without quite reaching the peak heat: daytime averages are 30°C, with 2 rain days and a 23°C sea. July is the hottest month, averaging 34°C by day, while August stays close at 33°C. Both average just 1 rain day, so rain is unlikely to shape your plans, though dry weather is not guaranteed. The catch is sustained warmth: nights average 24°C in July and 25°C in August. Choose accommodation where you can cool down comfortably, wear light clothing and move active outings towards morning or later afternoon. August has the warmest sea at 27°C, making it a good fit if warm water matters more than avoiding heat.

Autumn: warm seas linger as the chance of rain grows

September offers the strongest balance for a swimming holiday: days average 30°C, the sea stays at 26°C and there are only 2 rain days. It is still hot enough to plan shade breaks, rather than treating it as cool autumn weather. October is gentler at 25°C by day, while the 24°C sea remains inviting for many swimmers. Its 5 rain days mean outdoor plans need more flexibility than in September. November reaches 20°C by day, but nights fall to 13°C and rain days rise to 8. The sea retains warmth at 22°C, although cooler air makes lingering outside after a swim less appealing. Pack layers and rain protection rather than expecting uninterrupted beach days.