When is the best time to visit Khao Sok?

Khao Sok month by month

Long-run climate averages for Khao Sok National Park. Nothing here is a forecast for your date — it is what the last few decades have looked like on average.

Published long-run climate averages for Khao Sok National Park. Worth saying plainly: sources disagree on which month is wettest. One set of averages puts September highest at 409 mm; another puts October highest at 366 mm. The honest summary is that September and October are the two wettest months, and the gap between them is far smaller than the gap between either of them and February.

What “23 rain days” does not tell you

September is the month everyone points at: 409 mm of rain across roughly 23 days. Written that way it sounds like three weeks of standing in it.

Do the arithmetic instead. 409 mm spread over 23 days is about 18 mm on a day it rains — and a rain day, in the way these figures are counted, is any day with measurable rain at all. It could be an hour in the afternoon. It could be twenty minutes.

Here is what we will not claim: we cannot tell you how the rain will fall on your date. Nobody can. An average tells you the total for the month and the number of days it touched; it says nothing about whether your Tuesday gets a passing afternoon shower or a grey morning. Anyone who tells you otherwise is guessing.

What we can tell you is what happens to the day you booked. It runs. Khao Sok is a rainforest — rain is the normal condition here, not the exception, and the forest in rain is worth seeing. On the lake, rain tends to come in the afternoon and pass.

What actually changes, and what does not

We run these days every week of the year, so here is what genuinely differs between the wet months and the dry ones — which is less than the rainfall table makes it sound.

The lake water: no change

The lake looks the same in September as it does in February. The one thing that does change is the river on The Khao Sok Adventure Worth Taking: after rain it runs cloudy for about an hour, then it clears. That is the whole of it.

The water level: no change

It does not visibly drop in the dry months. The lake you see in the photographs is the lake you get, in any month.

The waterfalls: not the difference you are hoping for

They are not dramatically stronger in the wet season. If you are choosing September over February because you expect twice the waterfall, choose for a different reason — we would rather say so now than have you find out on the day.

The mist: the wet months add a second one

There is mist most mornings, all year round — that is not a rainy-season thing, and it is why Before the World Wakes runs when it does. What the wet months add is mist during the day: rain passes through, and it leaves mist behind it. That is the part worth staying for.

The mountains: this is the real trade

In the dry months the sky is open and the karst walls are clear all day. In the wet months cloud moves through them. Neither is better; they are different photographs.

The forest: greener when it rains

The rainy months leave the forest green and wet. In the dry months the leaves are drier.

Wildlife: no honest seasonal claim

We are not going to tell you one season is better for animals, because in our experience it is not. Whether you see gibbons or hornbills is luck, not the month you booked.

September

The wettest month of the year. The trade you are making is real: more chance of rain in exchange for dates that are still open a week out.

October

Close behind September on rainfall — and by one set of averages, ahead of it. Same trade, and the last month before the season turns. If you are choosing between the wet months, October is the one that starts to ease.

November

The turn. Rainfall drops to 247 mm and rain days to 18 — noticeably less than September or October, and still before the December peak. If there is a month that gets you easier dates and most of the drier weather, it is this one.

December, January, February

The dry stretch, and the busy one. February is the driest month of the year: about 21 mm across 4 days. December is the crossover, still carrying 88 mm.

This is also when the caves and viewpoints can hold a hundred people at once, and when specific dates close first. We never take more than 15 travellers on a day, so if you want a particular experience on a particular date in this window, book it early rather than late.

March, April, May

March is dry and hot — 33°C and 40 mm. April is the hinge: still 33°C, but rainfall jumps to 112 mm and rain days to 11. By May the wet season has properly arrived at 334 mm.

June, July, August

Steady wet months, 358–377 mm, around 21 to 22 rain days each, and highs settled at 30°C. Outside the December-to-March peak, wetter than November.

What does not change with the season

Which months suit which traveller

What we will not tell you

We will not tell you that the wet months are secretly the best months, because that depends entirely on what you came for. If you have three days in Thailand and you want them dry, come in February and book early.

We will not tell you the weather on your date. We will tell you what changes on the day, in advance, and we will run it.

And we will not tell you that a rain day is a ruined day, because the day you booked runs either way and we would rather you arrived knowing that than found out on the boat.

Next

If you are still working out the shape of the trip, how many days you need in Khao Sok is the other half of this question. If you want to know why there is a lake here at all, the story of Cheow Lan is worth ten minutes.

Or go straight to the five days themselves: The Cheowlan Everyone Dreams Of, The Khao Sok Way, Life Around Cheowlan, The Khao Sok Adventure Worth Taking and Before the World Wakes.