On the water, August and July are the same month. The south-west monsoon is still blowing offshore on the east coast, the Indian Ocean is still sending swell, and the points around Arugam Bay are running day after day.
The spread between them is what decides your week. Pottuvil Point, the long right north of the bay, comes up clean five days out of seven in August. Peanut Farm, on the same swell and the same wind, gives three. What separates them is how much swell each one needs to stand up, because the wind here spoils almost nothing. On this coast that spread is wider than the gap between one month and the next: the break you ride to matters more than the week you booked.
So build the week around moving. Four points spread over about twelve kilometres, a scooter or a tuk-tuk is part of the trip, and the habit worth forming is checking two before you commit to one. Elephant Rock, a right-hand point gentle enough for a beginner on the days it has swell, stays quiet even now, because almost nobody goes past the first break.
The south is shut until November, so everything happens on this side. Arugam Bay is six to eight hours from the airport across the interior, and the first day of the trip is a travel day.
August is also when the town is fullest. It lands inside the European school holidays, the town is small, and it is high season in price as well as crowds. The main street is a row of bars full of surfers from everywhere, which is either the point of the trip or the reason to come in June or September instead. Book the bed before the flight. The sea is 28°C, and a rash vest is all you pack for the water.

