Temperatures across various regions in Thailand to go up to 40-41°C between 31 Mar to 6 Apr
Summary
The Thai Meteorological Department forecasts a heat low-pressure system dominating upper Thailand from 31 March to 6 April 2026, producing hot, hazy and in places very hot conditions. Daytime temperatures may reach 40–41°C in parts of the North, Northeast and Central regions, while the Bangkok Metropolitan Administration has flagged the heat index as reaching the “Dangerous” category.
Key Points
- Forecast period: 31 March–6 April 2026; heat low-pressure system over upper Thailand.
- Peak daytime temperatures: some areas forecast up to 40–42°C (Northern max up to 42°C; North, Northeast, Central up to 40–41°C).
- Bangkok’s heat index classified as “Dangerous” by the Bangkok Metropolitan Administration.
- Isolated thunderstorms and gusty winds possible in several regions; coastal areas to see scattered showers, then fewer showers but hotter conditions from 2–6 April as westerly winds set in.
- Public health advice: protect against heat, monitor for heat exhaustion; vulnerable people should seek medical help if unwell.
- Storm safety: avoid open spaces, large trees and unstable structures during thunderstorms; farmers urged to secure crops and livestock.
- Marine conditions: waves around 1 metre, rising above 1 metre in areas with thunderstorms.
Content summary
The Thai Meteorological Department warns that a heat low will bring hot and hazy days across upper Thailand and very hot weather in parts of the North, Northeast and Central regions between 31 March and 6 April. Winds shift from southerly/southwesterly to westerly over the Andaman Sea, the South and the Gulf from 2 April, reducing showers but increasing daytime heat.
Regional forecasts give maximum temperature ranges: Northern 36–42°C, Northeastern 36–41°C, Central 35–41°C, Eastern 33–39°C, Southern east coast 32–38°C, Southern west coast 33–38°C, and Bangkok 33–39°C. Minimums vary by region but remain warm. Isolated thunderstorms with gusts are expected in several areas, and marine warnings note waves about 1 metre, higher with storms.
Context and relevance
This advisory matters for employers, HR teams, outdoor workers, event organisers, farmers and anyone responsible for vulnerable people. High heat and hazardous heat-index levels can lead to heat exhaustion and heat stroke, disrupt outdoor operations, and affect productivity and safety. The bulletin ties into broader trends of increasing extreme heat events that organisations need to plan for when scheduling work, managing wellbeing and protecting assets.
Why should I read this?
Because if you work outside, manage people who do, or run facilities in Thailand — this could wreck a week if you ignore it. It tells you when it’s going to be unbearably hot, where storms might hit, and what basic precautions to take so staff, crops and customers don’t pay the price. Short version: check your heat plans now.
Author note
Punchy and to the point: this is a weather alert with health implications. If you have employees, outdoor duties or supply chains in Thailand, act on the guidance rather than hoping it blows over.