The hottest month is the right month
Yes, you can swim in Green Lake, and people do it all summer — but it never feels like the Mediterranean. It is the reservoir behind the Oymapınar Dam, deep and mountain-fed, and it stays cool through the hottest weeks of the year. Our own tour notes put it simply: the lake is freshwater, so it feels cooler than the sea.
That makes the best month the hottest one. July, August and early September are when cool water is a reward rather than a shock, and when the hour we spend swimming there is the best hour of the day. In April and May the lake is at its most beautiful and least swimmable — most guests photograph it, dangle their feet and stay dry.
Why a mountain lake behaves nothing like the sea
The Mediterranean shallows off Side warm through the summer and hold that warmth into autumn. A deep reservoir does not. Water arrives cold and stays cold below the surface, so the top metre warms in the sun while everything beneath it does not — which is exactly why the first few strokes are startling and why the swim feels wonderful when the air is at 35 degrees and awful when it is at 22.
So do not plan this swim off a sea-temperature chart. Pick the day in your holiday with the highest forecast air temperature and put the lake on it — that single choice matters more than the month you are travelling in.
Month by month at Green Lake
April and May
Peak scenery. The countryside is green, the waterfalls are strong with the spring melt and the lake is a mirror. Swimming is for the determined. If you travel now, come for the views and the catamaran ride rather than the swim.
June
The turning point. Warm days make a short swim genuinely enjoyable, and the crowds have not arrived. A good all-round month if you want both the landscape and the water.
July and August
The best swimming months, without qualification. Hot air, long swim stops, and cold water that becomes the whole point of the day. Our Hidden Paradise tour from Side gives you around an hour in the lake during the catamaran ride and roughly two more hours at the Hidden Paradise pools below small waterfalls — three hours of cold water in the hottest part of the year is the best value in our summer programme.
September
Still hot enough for the swim, quieter on the walkways and softer light for photographs. Our pick if you want the summer experience without the summer crowds.
October onwards
Beautiful, cool and dry-footed. Access to canyon routes can be limited after heavy rain or in winter conditions, so plan an autumn trip as a scenery day, not a swimming one.
What the Green Lake day includes
The Hidden Paradise tour runs about seven hours for €40 per adult: round-trip hotel transfer from the Side area in air-conditioned vehicles, professional guiding, the catamaran ride on Green Lake, lunch at a family-run restaurant beside the falls, and the stops in between — Manavgat Waterfall, the old mosque of Oymapınar village, ancient aqueducts and a lookout over Green Canyon and Oymapınar Lake. Swimming breaks are about an hour at Green Lake and about two hours at the Hidden Paradise. Reservation is free, you pay on the tour day and cancellation is free up to 24 hours before; if weather cancels the day, rescheduling is free.
The order of the programme can shift with weather and road conditions, and the waterfall itself is weaker at the height of summer while the catamaran ride always runs.
If cold water is the point, go colder
The Sapadere Canyon tour is the harder version of the same idea: a wooden boardwalk suspended above the river in a gorge with rock walls rising up to 400 metres, ending at a chain of waterfalls and natural pools that are genuinely, memorably cold. It is a full day of about eight hours, adults €35 and children €23, with hotel pickup from the Side area and Alanya, a professional local guide, insurance and lunch of grilled fish or chicken included, vegetarian on request. The Cüceler "Dwarves" Cave is optional and paid at the entrance.
Sapadere in July and August is the coldest swim we sell and the best antidote to a hot beach week. In spring it is a walking trip with a view of water you will not get into.
Who should not book these days
- Anyone who wants warm-water swimming. Neither the lake nor the canyon pools will ever feel like the sea. If warm water is the goal, take a boat trip instead.
- Guests with serious walking or mobility difficulties — Sapadere specifically. The boardwalk is easy and needs no hiking experience, but it is not suitable for guests with real mobility problems, and we would rather say so than sell a difficult day.
- Late-season swimmers. From October the cold stops being refreshing. Come for the scenery instead and pack accordingly.
- Anyone expecting every entrance to be covered. The waterfall enclosure and the cave are paid locally, and drinks are separate on both days.
Planning it
Pick the hottest week of your holiday for the lake, not the mildest — that is the single decision that makes this day work. Then read what the Hidden Paradise tour costs, check what to bring for a day with three hours of swimming, and if you are travelling with children, how the day works with kids covers the pace and the pools.