Photo: Andre Mouton / Pexels
Thailand's rain is still heavy on 6 October 2026, though it is easing slightly. The Thai Meteorological Department (TMD) expects heavy rain in 40 provinces today, down from 46 on 5 October. Storms are likely across most of the country, highs are 32-35°C everywhere, and seas can get rough in thundershowers. Koh Lanta sits in Krabi province, which is in the Andaman coast's scattered-storm category today.
What is driving the weather
A high-pressure system from China covers the North, Northeast and upper Central regions. Easterly and southeasterly winds are bringing moisture from the South China Sea and the Gulf of Thailand. The southwest monsoon is also active over the Andaman Sea and Thailand.
Thundershowers, gusty winds, lightning and hail are likely in the North, Central (including Bangkok), East and South. The Northeast gets less rain.
Is it getting better?
A bit. The number of provinces expecting heavy rain was 32 on 4 October, 46 on 5 October and is 40 today. The rainy season is still active, so don't plan around dry days yet.
A second high-pressure system from China is forecast to reach the Northeast during 9-13 October, which could change conditions there. The source article is cut off after this point, so the rest of that warning is missing.
Regional forecast
| Region | Conditions | Min °C | Max °C | Wind |
|---|---|---|---|---|
| Bangkok | Fairly widespread thundershowers, isolated heavy rain, gusts | 24-25 | 33-35 | Variable, 10-20 km/h |
| North | Fairly widespread thundershowers, isolated heavy rain, gusts, hail | 21-24 | 32-35 | Variable, 10-20 km/h |
| Northeast | Scattered thundershowers | 22-23 | 32-34 | Easterly, 10-20 km/h |
| Central | Fairly widespread thundershowers, isolated heavy rain, gusts, hail | 23-25 | 33-35 | Variable, 10-20 km/h |
| East | Fairly widespread thundershowers, isolated heavy rain, gusts | 24-26 | 32-35 | Southeasterly, 15-30 km/h |
| South, east coast | Scattered thundershowers, isolated heavy rain | 22-24 | 33-35 | Westerly, 10-30 km/h |
| South, west coast (Andaman) | Scattered thundershowers, isolated heavy rain | 24-25 | 32-34 | Northwesterly, 15-30 km/h |
The Andaman coast and Koh Lanta
The Andaman coast covers Ranong, Phang Nga, Krabi and Trang. It has scattered thundershowers and isolated heavy rain today, with temperatures of 24-25°C at the low end and 32-34°C at the high end. Winds are northwesterly at 15-30 km/h.
The article does not name Koh Lanta specifically. It sits in Krabi province, so the Andaman forecast is the one to watch.
Seas
Waves on the Andaman (west) coast are about 1 m, and above 2 m in thundershowers. The Gulf side (east coast) is the same: about 1 m, above 2 m in storms.
For the lower south, east coast, the article's wording is unclear. It says "below 1 meter and above 2 meters in thundershowers", which is likely a typo for "about 1 meter".
Waves above 2 m can disrupt boat trips, ferries and island hopping on both coasts. The Andaman side has the stronger 15-30 km/h northwesterly winds, so check with your operator before heading out.
What to expect as a visitor
- Storms: Expect afternoon and evening storms across most of the country, with some heavy downpours. Lightning and gusts are likely.
- Heat: It is hot and humid, with highs of 32-35°C everywhere.
- Hail: Possible in the North and Central regions.
- Bangkok: Showers are widespread, so allow extra travel time and watch for flash flooding.
- Boats: Rough seas in storms may disrupt ferries and island trips.
Information sourced from The Thaiger.