Koh Larn month by month: when to go (and when to think twice)

Updated 16 June 2026 · We visit. We don't sell placement.

A travel-contextual calendar for Koh Larn — not a sterile weather table. What the sea, crowds and ferries are actually like in each month, and the best windows to visit.

By The Koh Larn Guide Editors · 6 June 2026 · 6 min read · Updated 16 June 2026

Plenty of pages give you Koh Larn's average temperature and rainfall. Less useful when what you actually want to know is: will the sea be calm, will the boats run, and will I be sharing the beach with a thousand people? Here's the month-by-month in travel terms — sea, crowds and ferries, not just millimetres of rain.

Cool, dry season — November to February (the best window)

This is prime time: the calmest, clearest sea, pleasant temperatures (low 20s to low 30s °C), and the most reliable ferries. It's also the busiest, especially over Christmas, New Year and Chinese New Year, and at weekends throughout. The trade-off is worth it — if you can only come once, come now, and go early on a weekday to dodge the crowds.

Hot season — March to early June

Hot and bright, with the sea usually still calm, particularly early in the day. April is the hottest and brings Songkran (Thai New Year, mid-April) — expect crowds and a festive, soggy mainland. Great beach conditions; just respect the sun, hydrate hard, and get your swimming done before the midday heat peaks.

Rainy / green season — late June to October

The monsoon brings heat, humidity and rain — often in short heavy bursts rather than all-day grey — with rougher, cloudier seas at times and the chance of reduced or cancelled boats. September and October are the wettest. Jellyfish are more likely inshore in these months. But it's quieter and cheaper, and plenty of calm bright mornings still land. Play it day-by-day: check the sky and the sea, and go if the morning's good.

Quick verdict by month

Jan–Feb: Excellent. Prime conditions, peak crowds.
Mar–Apr: Very good, very hot; Songkran crowds mid-April.
May: Good; first rains possible but often still fine.
Jun–Aug: Variable; monsoon building, watch conditions.
Sep–Oct: Poorest; wettest, roughest, check before going.
Nov–Dec: Very good to excellent; rains ease, peak returns.

Tip: Whatever the month, the first ferry of the day gives you the calmest water and the thinnest crowd. Time of day matters as much as time of year.

The verdict

Aim for November–February for the best all-round conditions, March–May for hot-and-calm, and treat the monsoon as a flexible 'go if the morning's good' option. Full conditions, fees and a weather table in our practical guide.