Sigiriya or Ella first from May to September

Sri Lanka has two monsoons arriving from opposite directions, which is why the island almost always has a coast in season. From roughly May to September the south-west monsoon brings rain and rough seas to the south and west coasts, and to the western slopes of the hill country.

It does far less to the dry zone. Sigiriya, Habarana, Polonnaruwa and Anuradhapura sit in the rain shadow and stay comparatively dry, which is why the Cultural Triangle is a reliable choice in exactly the months people write the island off.

The hill country is mixed. Ella sits on the eastern side of the central highlands and is less affected than Nuwara Eliya or the western slopes, though cloud and mist remain common at roughly a thousand metres in any month.

The arguments for Sigiriya first are structural rather than seasonal. The airport to Sigiriya drive is roughly four to five hours against seven to eight to Ella in any month, and the railway climbs from Kandy towards Ella regardless of the weather.

What changes is the end of the route rather than the beginning. Instead of descending from Ella to the south coast in roughly four to five hours, the trip either finishes in the north-east around Trincomalee or bends south-east to Arugam Bay.

That makes the Trincomalee version interesting, because it is one of the few cases where ending in the northern half of the island is genuinely convenient. Trincomalee sits within reasonable reach of Sigiriya and Habarana, so the route can run inland to the coast and back out without crossing the whole country.

Trincomalee and Nilaveli are the usual substitutes for Mirissa, with wide quiet sand and calm water through this window. Pigeon Island offers snorkelling from Nilaveli, and the standing reminder applies: do not stand on or touch the coral, and keep fins clear of the reef.

Whale watching moves with the season, running off Trincomalee roughly May to September rather than off Mirissa. The same rules on operator conduct hold: responsible boats keep their distance, do not chase or encircle animals and limit the vessels around a sighting.

Arugam Bay serves a different traveller. Its surf season runs roughly April or May to September, which makes it the natural south-eastern finish for a trip built around waves rather than swimming, and it is reachable from Ella without returning through Kandy.

This is the window in which the dry zone is the most reliable part of the country, and an itinerary that gives it three or four nights rather than two is making the most of the season rather than compromising.

The wildlife argument reinforces it. The elephant gathering around the Minneriya and Kaudulla reservoirs is usually strongest from roughly June to September, when receding water draws large numbers to the grassland, though it shifts with water levels and should be confirmed locally rather than assumed.

Polonnaruwa at roughly an hour and a half from Sigiriya and Anuradhapura at roughly two hours both become easier to justify with the extra nights. Lankan Stays and Trails weights summer itineraries towards the Cultural Triangle and the east for exactly this reason.

Some travellers have fixed dates and a fixed wish to see Galle and the south coast, and it is worth being straightforward about what that involves. Rain in this window tends to come in heavy bursts rather than all day, so sightseeing is usually possible, but the sea can be rough and swimming is often unwise.

Galle Fort works in any weather, since the ramparts and the old town are as good under cloud as under sun. Whale watching from Mirissa does not run in this window, so that particular reason to be there disappears entirely.

The honest recommendation is to treat the south in this window as a cultural stop rather than a beach stay, and to put the actual beach nights on the east coast. That produces a trip that works with the season rather than against it.