Sri Lanka's north-east monsoon: where the rain goes, and why it is the best time for the south

Sri Lanka's north-east monsoon runs from about December to February. It brings rain to the north, the east coast and the eastern side of the hills, while the south and west coasts, around Galle, Mirissa and Bentota, have their best weather of the year. It is wettest at the start and usually easing by late January.

In other words, the north-east monsoon is not a reason to stay away. It is the reason the island's most popular season exists: the classic route of ancient cities, tea country, a leopard park and the south coast works best in these months, as long as you leave the east coast for the summer.

What is the north-east monsoon?

Sri Lanka's weather is shaped by two monsoons blowing from opposite directions. From about May to September, the south-west monsoon brings rain to the west and south. From about December to February, the wind turns, and the north-east monsoon blows in across the Bay of Bengal, bringing its rain to the opposite side of the island.

The central hills sit in the middle like a wall. Whichever side faces the wind gets the rain; the other side sits in the shelter. In these months, that leaves the south-west coast and the western hills in their dry season, which is why December to April is the classic time for Galle and the south.

The start of the season blurs into the end of the second inter-monsoon, in October and November, when storms can form in the Bay of Bengal. Cyclone Ditwah, in late November 2025, was the most damaging recent example, and it is why the first weeks of the north-east monsoon need more care than the rest. We explain the months before it in Sri Lanka's second inter-monsoon.

Where the rain goes, and where it does not

The south and west coasts are where the season shines. Mirissa's whale boats are working, Bentota and Galle have calm water, and the beaches fill up from Christmas.

In the hills, the side matters. Nuwara Eliya and the estates around Hatton dry out through December and have their clearest weather from January to March; we cover the first month in Nuwara Eliya in December. The eastern slopes face the wind, so Ella and the hills towards Badulla can stay wetter in December, and last year several divisions there were under landslide warnings.

The east coast is in its wet season. Trincomalee and Arugam Bay see heavy rain and rough seas, and much of Arugam Bay closes until spring. Jaffna and the north take the first and heaviest rain, then dry out from about February.

How it changes month by month

• •December: the monsoon arrives. The north and east are at their wettest, the Cultural Triangle can still see heavy showers, and the south-west coast settles into its season as the month goes on.
• •January: the rest of the island steadies. The east coast is still wet, but the Cultural Triangle, the hills and the south are usually dry, and Horton Plains starts to clear.
• •February: the driest month across most of the island. Even the north begins to dry out, and the east coast's rain eases.
• •March: the monsoon fades into the first inter-monsoon, with hot days and the first afternoon storms.

For the detail of each month, see Sri Lanka in December, Sri Lanka in February and Sri Lanka in March.

This year has an extra variable. The Department of Meteorology expects El Niño's effects to strengthen from December to February, so we will be watching the seasonal forecasts closely and planning a little more slack into December trips than usual.

Is it a good time to travel?

Yes, for most first trips it is the best time of year, as long as the route faces the right way.

What the north-east monsoon does well

• •The south coast. Calm seas, dry days and the whale season, from December onwards.
• •The classic route. The Cultural Triangle, the hills, Yala and the south all work together, especially from January.
• •The hills. The western side of tea country is at its clearest from January to March.
• •Adam's Peak. The pilgrim season opens in December and runs until Vesak in May.

What it does not do well: the east coast, the far north in December, the eastern hills early in the season, and quiet beaches over Christmas and New Year.

Dates for December 2026 to February 2027

• •Wednesday 23 December 2026: Unduvap Full Moon Poya, and the opening of the Adam's Peak pilgrim season.
• •Friday 25 December: Christmas Day. The south coast is at its busiest from around 20 December to New Year.
• •Friday 15 January 2027: Thai Pongal, the Tamil harvest festival, celebrated across the north and east.
• •Friday 22 January: Duruthu Full Moon Poya, marked by the Duruthu Perahera at the Kelaniya temple near Colombo.
• •Thursday 4 February: Independence Day, with ceremonies in Colombo and busier roads.
• •Saturday 20 February: Navam Full Moon Poya, around which Colombo's Gangaramaya temple holds its Navam Perahera.
• •On every Poya day: alcohol and meat are not sold, and temples fill with families in white.
• •All season: the winter schedule for domestic flights, serving the south coast, the hills and the Cultural Triangle.

How we route a trip in these months

1. 01Nights 1 to 3: the Cultural Triangle. Sigiriya at opening, Dambulla and Polonnaruwa, best from mid-December onwards.
2. 02Nights 4 to 6: Kandy and tea country. The western hills, with Horton Plains at dawn from January, and the train from Nanu Oya to Ella.
3. 03Nights 7 and 8: Yala. Down into the dry zone for two game drives.
4. 04Nights 9 and 10: the south coast. Galle or Mirissa, with the whales in season and the sea at its calmest.

This is our Ceylon Icons journey, and these months are when it works without compromise. If wildlife matters most, Wild Ceylon pairs two contrasting parks with the whale shelf off the south coast. In December, we keep the Cultural Triangle and Ella nights flexible, in case the first weeks of the monsoon reach further than usual.

What to book first

1. 01Your south-coast hotel, months ahead for Christmas, New Year and the weeks around them.
2. 02Tea-estate bungalows, which have very few rooms and are at their best in these months.
3. 03A car and driver, so the route can bend away from a wet day.
4. 04Train seats from Nanu Oya to Ella, on the day the 30-day window opens.
5. 05The whale boat from Mirissa, with a night there beforehand and a spare morning after.

Who these months suit

• •First-time visitors who want the classic route with no part of it compromised.
• •Beach lovers, on the south and west coasts.
• •Families on a Christmas trip, if the rooms are booked early.
• •Walkers and photographers, for the clear mornings in the western hills from January.

Less suited: travellers set on the east coast or Arugam Bay's surf, anyone heading to Jaffna in December, and last-minute bookers over Christmas and New Year.

If you are travelling between December and February, tell us your dates. We will point the route at the dry side of the island, keep a spare day for the monsoon's first weeks, and book the coast before it fills. Plan my Sri Lanka trip.

Last checked 18 October 2026.

Author @Mahinsa Hennakgedara