On May 5, 2025, Taiwan is experiencing a weather pattern characterized by high temperatures and humidity due to southwest wind subsidence. Taitung County has reported the occurrence of foehn winds, prompting the Central Weather Bureau (CWB) to issue an orange high-temperature alert. The warm weather is expected to transition dramatically as a frontal system approaches the island, heralding a significant change in weather conditions starting on May 6.
The CWB has indicated that the first frontal system will begin impacting Taiwan on May 6, bringing with it localized short-term showers and thunderstorms, particularly affecting northern and northeastern regions. As the day progresses, the rain intensity is expected to increase, especially in the late afternoon and evening. This pattern of unstable weather will persist until May 7, with potential localized heavy rain in central and northern Taiwan, as well as mountainous areas.
Weather forecaster Chen Yi-an emphasized the need for the public to remain vigilant during this period. "The rain will start to become more pronounced, especially in the northern and northeastern areas, with afternoon thunderstorms anticipated in Taipei, Yilan, and mountainous regions," Chen explained. The CWB has advised residents to be cautious of sudden downpours, thunderstorms, and strong winds associated with this weather system.
Temperatures before the rainfall on May 6 are expected to remain high, hovering around 28-29 degrees Celsius. However, once the rain begins, daytime highs are projected to drop significantly, particularly on May 7, where northern areas may see temperatures fall to about 24-25 degrees Celsius, while central regions could reach 26-27 degrees Celsius. In contrast, southern Taiwan might still experience warmer conditions, with highs around 29-32 degrees Celsius.
From May 8 to May 9, the CWB forecasts a brief respite from the rain, with moisture levels decreasing slightly. However, sporadic showers may still occur, particularly in northern and northeastern Taiwan. Chen noted that the weather will stabilize somewhat during this period, but afternoon thunderstorms in mountainous areas should still be anticipated. "The weather will be relatively stable, but it’s essential to stay alert for afternoon thunderstorms," he advised.
As the second frontal system approaches on May 10 and May 11, the CWB warns that rain will return to all parts of Taiwan, with a potential for localized heavy rainfall in central and northern regions. The most significant temperature drop is expected to occur on May 11, where highs in the northern and central areas may plummet to between 22-24 degrees Celsius, while southern regions may still see temperatures around 27-28 degrees Celsius.
In addition, the CWB has reported that the Pacific high pressure system remains strong, which prevents the typical Meiyu season pattern from forming despite the upcoming frontal systems. This means that while the fronts will bring rain, they may not lead to the sustained rainfall typically associated with the Meiyu season.
Lin Po-tung, a director at the CWB, reiterated the importance of preparedness as the week progresses. "We are expecting two frontal systems this week, and while the first will bring rain from May 6 to 7, the second will follow closely behind, affecting the weather over the weekend," he stated. The public is advised to stay updated on weather alerts and prepare for potentially severe weather conditions.
Overall, the coming week will feature fluctuating temperatures, with daytime highs generally ranging from 28 to 31 degrees Celsius. The CWB predicts that May 9 may be the hottest day of the week, with temperatures in Taipei possibly reaching 33 degrees Celsius and mountainous areas in central and southern Taiwan exceeding 35 degrees Celsius.
As the weather evolves, the CWB will continue to monitor conditions closely and provide updates. Residents are encouraged to remain aware of changing weather patterns and to take precautions against severe weather, particularly during the expected thunderstorms.
In summary, Taiwan is bracing for a week of dynamic weather, with two frontal systems set to bring rain and cooler temperatures, especially in the northern and central regions. The public should prepare for the possibility of thunderstorms and localized heavy rain, especially from May 6 through May 7 and again from May 10 through May 11.
