BANGKOK– Thailand is heading into another stretch of intense heat, and the Thai Meteorological Department has warned that many areas could face very high temperatures. In some parts of the country, especially the North, Northeast, and Central regions, daytime highs may rise to 41 degrees Celsius. Forecasters say a heat-driven low-pressure system, along with hazy daytime skies, is pushing temperatures higher.
The outlook covers late March through early April 2026. Although a few areas may get brief thunderstorms and gusty winds, most places should expect hot to very hot weather. Because of that, people across upper Thailand should get ready for both discomfort and possible health risks.
Latest Warning From the Meteorological Department
The Thai Meteorological Department has issued weather alerts for March 30 to April 5, 2026. Across upper Thailand, conditions will stay hot, and some places will turn extremely hot. Nighttime lows are expected to range from 17 to 26°C, while daytime temperatures may climb to 36 to 42°C.
Key points from the forecast include:
- The North is expected to see very hot weather, with some spots topping 40°C.
- The Central and Northeast regions will likely record highs of 36 to 41°C.
- Daytime haze will remain noticeable, which may reduce visibility and make the heat feel worse.
At the same time, thunderstorms may affect around 10 to 20% of upper Thailand. These storms could bring short bursts of rain, strong winds, and isolated hail. Still, the heat will remain the main weather pattern through most of the day.
Chiang Rai Faces Heat and Poor Air Quality
In Chiang Rai, many residents are already feeling the rising heat. Daytime temperatures are expected to sit in the mid-to-high 30s°C, and some areas could come close to 40°C over the next few days. Nights will be slightly cooler, with lows around 20 to 25°C.
However, the heat is only part of the problem. Air quality in Chiang Rai remains poor because of high PM2.5pollution. The Air Quality Index, or AQI, is currently in the unhealthy range, often around 150 to 200 or even higher. Fine particles from dust, farm burning, and traffic emissions are lingering in the air, especially during dry and hazy weather.
As a result, people in the area are dealing with two problems at once. The heat puts stress on the body, and the polluted air makes it harder to breathe. This can raise health risks for everyone, but children, older adults, and people with lung or heart issues face the greatest danger.
Why This Heat Can Be Dangerous
Extreme heat is not just unpleasant; it can be serious. When temperatures move toward 41°C, and humidity pushes the heat index even higher, the body has a harder time cooling down. That can lead to heat cramps, heat exhaustion, or heatstroke.
Last year, health officials reported hundreds of heat-related illnesses and several deaths. Many of those cases were linked to people working outdoors during the hottest hours of the day. In most places, that danger period falls between 11 a.m. and 3 p.m.
Some groups face a higher risk than others:
- older adults
- young children
- pregnant women
- outdoor workers and athletes
- people with long-term conditions such as heart disease or diabetes
Even healthy adults can become weak, dizzy, or sick if they stay too long in direct sunlight or push themselves too hard.
Simple Ways to Stay Safe in the Heat
Weather and health officials are urging people to limit outdoor activity during the hottest part of the day whenever possible.
These steps can help:
- Stay indoors, or rest in shaded or air-conditioned places between 11 a.m. and 3 p.m.
- Drink plenty of clean water, ideally at least one glass every hour, even if you don’t feel thirsty.
- Wear loose, light-colored, breathable clothes, and use a wide-brimmed hat if you need to go outside.
- Avoid alcohol, coffee, tea, and sugary drinks because they can make dehydration worse.
- Take regular breaks in the shade if you work outdoors.
- Never leave children or pets inside parked cars, because temperatures can rise fast within minutes.
- Check on elderly relatives, neighbors, or anyone living alone.
If someone starts sweating heavily, feels weak, gets a headache, or seems confused, get medical help right away. Fast treatment can stop the condition from getting worse.
Why the Heat Feels More Intense This Year
This year’s hot season appears harsher than usual in some northern provinces. Dry season conditions, along with broader climate patterns, are making the air feel heavier and warmer. When humidity rises, the “feels-like” temperature can go well above the actual reading.
In Chiang Rai and nearby provinces, PM2.5 pollution is making daily life even harder. Smoke and dust can irritate the lungs, and high heat forces the body to work harder at the same time. That mix can wear people down quickly.
Farmers and outdoor laborers face added pressure. Because of that, officials are asking them to shift work hours when possible, protect animals and crops, and keep a close eye on weather updates.
The hot spell is expected to continue into early April. A few places may see scattered thunderstorms that bring short-term cooling and some rain. Even so, those storms will likely be isolated and brief.
Meanwhile, haze is expected to remain in many areas until stronger winds or wider rainfall help clear the air. The Meteorological Department will keep posting updates, so residents should follow official forecasts or trusted weather apps for local conditions.
Protecting Your Household During the Heat Wave
Small changes can make a big difference during very hot weather. Try to plan errands early in the morning or later in the evening, when the sun is less intense. During the day, keep curtains closed to help indoor spaces stay cooler. Also, make sure family members who are more at risk drink enough water and get time to rest.
Schools, offices, and local agencies are also making changes in some areas. These include moving outdoor activities, shortening time in the sun, and setting up shaded rest spots where needed.
Thailand’s hot season always brings hard days, but this year’s mix of high temperatures and poor air quality calls for extra care. That is especially true in Chiang Raiand other northern provinces, where both the heat and pollution have reached troubling levels. Keeping up with official weather alerts and air quality updates can help people make safer choices day by day.
Official information comes from the Thai Meteorological Department and local air quality monitoring stations. For the most accurate forecast, residents should check government sources for their own province.
