The rainy season in much of Thailand is from May to October. In Koh Samui and the south east of Thailand it is from November to March. However, the rainy seasons have been unpredictable in recent years. Heavy storms can cause disruption including from flooding and landslides. Lakes, caves and waterfalls are particularly prone to dangerous flash flooding during the rainy season.
The Thai Meteorological Department posts official updates and weather warnings on its website.
The Mekong River Commission posts updates on the Mekong River levels on its website.
Northern Thailand can be subject to earthquakes and tremors of varying magnitude.
The Earthquake Track website lists recent seismic activity. To learn more about what to do before, during and after an earthquake, see the website of the US Federal Emergency Management Agency.