Taipei: A frontal weather system will begin affecting Taiwan on Friday night, bringing significant rainfall across the island and causing temperatures to drop over Mother's Day weekend, a weather forecaster said.

According to Focus Taiwan, the Central Weather Administration (CWA) issued heavy rain advisories for the Greater Taipei area, northeast Taiwan, and mountainous areas in Hualien, Nantou, and other regions as of Friday evening. The CWA forecasts widespread showers or thunderstorms across Taiwan on Saturday as the frontal system moves in, with forecaster Chen Pei-an providing insights to CNA.

Following the front's passage over Taiwan on Sunday, the associated rainband is expected to gradually shift southward, increasing the likelihood of showers or thunderstorms in central, southern, and southeastern parts of the island. Other regions might experience brief, scattered showers or thunderstorms.

The front is predicted to move south to the Bashi Channel on Monday, although moisture from the system will continue to affect southern and southeastern Taiwan. Some areas may encounter brief showers, thunderstorms, or heavy rainfall. Starting Tuesday, most regions are expected to experience partly cloudy to sunny skies as ambient moisture decreases, with only brief, isolated showers anticipated in mountainous regions during the afternoon.

Temperature forecasts by the CWA indicate cooler weather over the weekend due to the frontal system. Daytime highs are expected to drop to 24-26 degrees Celsius in northern Taiwan and Yilan, 26-28 degrees in central and southern regions, and 26 degrees in eastern Taiwan. On Sunday, central and northern Taiwan, along with Yilan and Hualien, will experience cooler conditions with highs between 21-23 degrees, while Taitung and southern Taiwan will see highs of 24-26 degrees Celsius. A significant decrease in moisture in central and northern Taiwan, Yilan, and Hualien could lead to daytime highs returning to around 28 degrees Celsius on Monday.