The rainy season in much of Thailand runs from May to October, with September and October being the height of the monsoon season. The rainy season in Koh Samui and the south east of the Thai peninsula runs from November to March. Heavy storms during the monsoon can cause disruption and damage including flooding and landslides. However, the monsoon seasons have been unpredictable in recent years. The Thai Meteorological Department posts official updates and weather warnings on its website.
The Mekong River Commission posts official updates on the Mekong River on its website.
Lakes, caves and waterfalls are particularly prone to dangerous flash flooding during the rainy season.
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.