The Thai Meteorological Department forecast today (May 11, 2026) that upper Thailand would remain hot during the day, while thunderstorms and gusty winds were still expected in some areas.
The conditions are due to a weakening high-pressure system, or cold air mass, from China covering the Northeast and the South China Sea, while southerly and southeasterly winds are bringing moisture from the Gulf of Thailand and the South China Sea into upper Thailand.
People in affected areas are advised to beware of thunderstorms and gusty winds by avoiding open spaces, large trees, unstable structures and unsecured billboards.
They should also watch for heavy and accumulated rainfall, which could trigger flash floods and forest run-off, especially on foothill slopes near waterways and in low-lying areas.
Farmers are advised to strengthen fruit trees and prepare measures to prevent possible damage to crops and livestock, while people should take care of their health during changing weather conditions.