The 2026 heat crisis will arrive earlier than usual. "Why is it so hot this year?" and "When will it be hottest?" Watch for the dates when the sun is directly overhead at 41-42 degrees.
Mr. Somkuan Tonjan, Director of the Weather Forecasting Division at the Meteorological Department, provided information based on weather analysis. This year's heat will come in significant waves as follows.
• The hottest period is expected to be just before Songkran, around 8-9 April 2026.
• Maximum temperatures: In the Northern and Upper Central regions, it may soar up to 41-42 degrees Celsius.
• Sun directly overhead phenomenon: On 27 April 2026, the sun will be directly above Bangkok, which will intensify accumulated heat if the skies are clear and there is no rain.
Although statistically average temperatures may be similar to previous years, the factors making us feel "oppressively hot" are as follows.
Accumulated heat since mid-March: Clouds decrease, allowing direct sunlight to reach the earth's surface, causing continuous heat buildup.
Urban factors: For Bangkok residents, heat from buildings, concrete, and electricity use effectively trap heat.
Relative humidity: In Bangkok, the heat feels "hot and humid" because southern and southeastern winds bring moisture from the Gulf of Thailand, making it feel sticky and uncomfortable compared to the "dry heat" in the North.
During March, thunderstorms and seasonal storms may help reduce temperatures in some areas, especially in the North and South, but may bring strong winds and hail in certain places.
The greatest concern when temperatures reach 40 degrees Celsius is heat stroke.
At-risk groups: People with chronic conditions like high blood pressure and those working outdoors.
Precaution: Being in direct sunlight for just 30 minutes can cause heat stroke.
Prevention: Drink plenty of water frequently throughout the day to help dissipate body heat.