BANGKOK – The Thai Meteorological Department (TMD) has issued a nationwide alert as a massive heatwave grips the country. With temperatures soaring between 35°C and 40°C in many regions, authorities are warning citizens about the rising risk of heatstroke.
The extreme weather is being caused by a low-pressure cell settling over upper Thailand. This system is trapping heat and creating hazy, stifling conditions during the day. While April is traditionally the hottest month in Thailand, officials say this year’s “heat index”—the temperature it actually feels like to the human body—is reaching dangerous levels.
North and Northeast Face the Most Extreme Heat
Residents in the northern provinces, including Chiang Rai, are being urged to stay indoors during the hottest parts of the day. In the North, the mercury is expected to hit a blistering 42°C in some areas.
The TMD reports that the heat is not just about the numbers on the thermometer. High humidity is pushing the heat index significantly higher, making it difficult for the body to cool itself down through sweat.
Regional Temperature Forecast:
- Northern Region: Highs of 36°C to 42°C. Expect haze and very hot conditions in provinces like Chiang Rai, Tak, and Mae Hong Son.
- Northeastern Region: Highs of 36°C to 41°C. Some areas may see isolated thunderstorms, but they will bring little relief from the heat.
- Central Region: Highs of 35°C to 42°C. Bangkok and the surrounding areas are seeing a “dangerous” heat index, often feeling like it is over 50°C.
- Southern Region: Highs of 32°C to 38°C. While slightly cooler than the north, the humidity remains high with scattered showers.
Understanding the Danger of Heatstroke
Medical experts from the Department of Disease Control (DDC) are warning that these conditions are a recipe for heatstroke. Heatstroke happens when the body’s core temperature rises above 40°C. If not treated quickly, it can cause organ damage or even death.
“The heat index is more important than the air temperature right now,” said a spokesperson for the Bangkok Metropolitan Administration. “When the humidity is high, your sweat doesn’t evaporate, and your body can’t get rid of the heat. This is when people start to collapse.”
Signs of Heat Exhaustion and Heatstroke:
- Extreme thirst and a dry mouth.
- Dizziness, headaches, or feeling faint.
- Rapid heartbeat and heavy breathing.
- An absence of sweat despite the high heat (a major red flag).
- Confusion or loss of consciousness.
How to Stay Safe During the Heatwave
Authorities have released a set of guidelines to help the public cope with the soaring temperatures. Vulnerable groups, including the elderly, young children, and those with chronic health conditions, are advised to take extra precautions.
- Hydrate Early and Often: Drink at least 8 glasses of water a day. Do not wait until you are thirsty to drink.
- Avoid the Peak Sun: Stay indoors between 11:00 AM and 4:00 PM when the sun is at its strongest.
- Dress Light: Wear loose, light-colored clothing made of breathable fabrics like cotton.
- Skip the Alcohol: Drinks with alcohol or high sugar can actually dehydrate your body faster.
- Check on Neighbors: Ensure that elderly relatives or neighbors living alone have access to fans or air conditioning.
Farmers and Outdoor Workers at Risk
The TMD has also sent out a specific warning to the agricultural sector. Farmers in the North and Northeast are being told to protect their livestock and crops. High temperatures can lead to sudden “summer storms” with gusty winds and hail, which can damage fruit trees and unsecured buildings.
Outdoor laborers, such as construction workers and street vendors, are encouraged to work in pairs. This “buddy system” allows workers to monitor each other for signs of confusion or physical distress.
Looking Ahead: When Will it Cool Down?
The current forecast suggests that the intense heat will continue through the first week of April. While some westerly winds are expected to bring scattered rain to the South and parts of the Central plains, the overall trend remains “hot to very hot.”
For now, the message from the government is clear: take the heat seriously. Stay hydrated, stay in the shade, and keep a close eye on your health and the health of those around you.
April 2-7, 2026: Hot to very hot weather across Thailand
This video provides a direct forecast from the Meteorological Department regarding the specific dates and extreme temperatures expected across the country.
