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The best time to visit Marmaris is from May to October, and June and September are the two best months. August is the driest month and the sea peaks near twenty-eight degrees, but September gets almost the same water without August's thirty-five-degree afternoons.
November to February is the window to avoid. Marmaris is by a wide margin the wettest of the Turkish coast destinations, and its December alone takes more rain than Izmir's December and January combined.
June and September are the two best months in Marmaris. Both pair air in the low thirties with a sea above twenty-three degrees and very little rain.
September has the edge. The sea sits at twenty-seven, almost its August peak, without August's thirty-five-degree afternoons.
May is dry and about twenty-six degrees, comfortable for the town and the coast paths.
The sea is the limit. At twenty degrees it is swimmable but cool, so May suits walking and boat trips more than long swims.
July and August are the driest months of the year, with August recording almost no rain at all, and the sea at its warmest near twenty-eight degrees.
They are also the hottest, at about thirty-five degrees. Marmaris ties with Fethiye as the hottest of the Turkish coast resorts, so if the heat concerns you, Kas runs a couple of degrees cooler.
October is the last good month. The sea holds at about twenty-four, warmer than June, while the air eases back to twenty-six.
The Marmaris regatta runs in late October every year, drawing domestic and international crews, which gives the shoulder month a reason of its own.
December is the wettest month of the year and January is close behind. Marmaris is by a wide margin the wettest of the Turkish coast destinations: its December alone takes more rain than Izmir's December and January combined.
This is the window to avoid. The sea bottoms out near seventeen degrees and the beach season is over.
March and April are mild and drying out on land, in the high teens to low twenties, and good for the coast and the trips inland.
The water is still cold. April's sea is about seventeen degrees, so this is not a beach window whatever the air temperature says.
Marmaris is a sailing town first, with two major marinas and several smaller ones, and it is one of the main gulet departure ports alongside Bodrum, Fethiye and Antalya, running to Dalyan, Gokova and Kekova.
It also does not fully close in winter. Hundreds of cruising boaters winter here, so unlike Oludeniz there is a living town out of season, though it is a marina scene rather than a beach holiday. Summer day trips run by sea to Symi and Rhodes.