The south-west monsoon is established by June, the offshore is reliable, and the swell that has been building since May arrives with enough size to run the full length of the Main Point at Arugam Bay. That is the wave that made the name. It breaks over coral, and it is the only one of the four with a crowd on it.
The other three are the reason to stay rather than visit. Whiskey Point is twenty minutes north of the bay with nobody on it and nothing listed to catch you. Peanut Farm is at the end of a track through scrub and is the most productive of the four in season. Elephant Rock is forty minutes further, is a right-hand point gentle enough for a beginner, and is empty even in August. Almost nobody drives past the first point, and that is the whole opportunity: twelve kilometres of coast, four waves, and one of them absorbing everybody.
The rest of the island is on the other schedule, which catches people out every year. The south coast is wet and onshore and the camps around Weligama are closed or half empty, so anyone landing in Colombo planning to drive south has booked the wrong month.
Four coasts are at their own peak in June and Sri Lanka is not among them; Nicaragua and Costa Rica are both at 29°C and both are Pacific beach breaks with a very different character. What June buys here is the last quiet month. The town is running, the bars are open, somebody arriving alone is not alone by the first evening, and it has not yet become the row of surfers from everywhere that July makes of it.

