BANGKOK, THAILAND – Thailand’s summer was officially set to begin on 22 February 2026, with temperatures forecast to climb to 43°C and authorities warning of heatstroke and severe summer storms.
Summer officially declared with up to 43°C nationwide
The Thai Meteorological Department announced that the hot season would officially start on 22 February 2026, with nationwide temperatures potentially reaching up to 43°C. Authorities stated that the onset of the hot period significantly increased the risk of heatstroke across the country.
Rising heat and shifting winds mark seasonal change
According to Sukanyanee Yawinchan, director-general of the Meteorological Department, current data from northern regions already showed peak values above 35°C, with large areas dominated by hot air masses. At the same time, winds shifted to southern and south-eastern directions, marking the meteorological transition into the summer period.
Clash of air masses to trigger strong summer storms
At the beginning of the season, remaining cold air masses were expected to collide with incoming heat, which the agency said could produce several days of pronounced summer storms. Between 23 and 25 February, forecasters expected thunderstorms, strong gusts and isolated hail, before temperatures briefly eased and then rose again.
Northern provinces face extreme local heat
For summer 2026, the end of the hot phase was projected for around mid-May, with values between mid-March and April possibly clearly exceeding those of the previous year. In northern provinces such as Mae Hong Son, Lampang and Tak, experts said local temperatures could surpass 42°C.
Global patterns and rainfall near normal levels
On a global scale, this year’s summer was expected to be shaped by a weakening La Niña phenomenon, transitioning into neutral conditions. As a result, overall rainfall amounts were forecast to remain close to average, while slight dryness could develop in northern, central and eastern regions.
Health advice and daily routines in extreme heat
The director-general urged the public to exercise particular caution in the heat and to avoid outdoor physical activities between 10:00 and 19:00, when the heat index was highest.
“People should pay closer attention to signs of heatstroke and handle open fire carefully, as the dry conditions come with an increased risk of fires and forest fires.”
said Sukanyanee Yawinchan, director-general of the Meteorological Department.
Warnings, hotlines and official information channels
The Meteorological Department recommended that residents follow current forecasts and warnings regularly to stay prepared for sudden summer storms and extreme heat. The agency provided updated information via its website www.tmd.go.th and through the 24-hour emergency hotline 1182.