Severe summer storms are forecast to impact northern, northeastern, and central Thailand from April 26 to May 2, 2025, with widespread thunderstorms, frequent lightning, damaging winds, and reports of hail expected, particularly in the northern region. Central areas, including Bangkok, face a 40% likelihood of rain and flash flood warnings, while strong winds threaten crops in both central and eastern zones. Maritime hazards will increase, especially before April 29. Further details explain the risks and recommended precautions.
As summer approaches, Thailand faces a heightened threat from seasonal storms forecast to impact the nation between April 26 and May 2, 2025. Meteorological models indicate widespread instability during this period, with a particular focus on the northern, northeastern, and central regions.
The onset of a moderate high-pressure system from China, extending over Vietnam and the South China Sea, is expected to clash with heat-induced low pressure and a westerly trough arriving from Myanmar. These factors will result in wind convergence over upper Thailand, amplifying the likelihood of severe weather.
Northern Thailand has already reported incidents of hailstorms, frequent lightning, and gusty winds capable of destabilizing weak structures and damaging agriculture. Residents in affected areas are advised to remain cautious of severe weather, especially during periods of increased thunderstorm activity. In the northeast, thunderstorms accompanied by isolated heavy rainfall increase the risk of flash flooding, particularly in low-lying and foothill communities.
Central Thailand, including the Bangkok metropolitan area, faces a 40% probability of rain, with flash flood warnings issued for vulnerable zones. The eastern region is also at risk, particularly for agricultural interests, as strong winds could lead to crop damage.
During April 26–28, southern provinces are forecast to experience heavy rainfall due to wind convergence from the Gulf of Thailand and the Andaman Sea, with maritime hazards including waves exceeding two meters. While wave heights are expected to subside to below one meter from April 29 to May 2, localized thunderstorms and associated hazards will persist. Wave heights in the Andaman Sea are forecast to reach over 2 meters during thunderstorms, increasing the risk for small boats and coastal activities.
Heavy rainfall and waves over two meters threaten southern provinces April 26–28, with lingering thunderstorms and maritime hazards expected into early May.
After May 1, storm activity may partially ease, but sporadic thunderstorms are likely to continue. Authorities have urged the public to avoid open areas, large trees, and unstable shelters during storms, and to stay updated on real-time weather advisories.
Farmers are advised to reinforce crop protection and livestock shelters, while residents are encouraged to prepare emergency kits for potential power outages or flooding. Maritime operators are advised to navigate cautiously and avoid thunderstorms at sea.
The pattern of repeated summer storm warnings over March and April suggests ongoing climatic instability, with increasing frequency of hailstorms noted in upper Thailand. Rising temperatures continue to elevate thunderstorm risks, underscoring the need for preparedness across all sectors.
