Taipei, Dec. 11 (CNA) The arrival of a northeasterly wind system will push daytime temperatures lower by 3 to 4 degrees Celsius in northern and northeastern Taiwan from Wednesday to Friday, according to the Central Weather Bureau (CWB).
The CWB said the strength of the new weather system will ease starting Friday, helping daytime temperatures recover until Dec. 17.
Daytime highs in northern and northeastern Taiwan on Wednesday are expected to range between 20 and 21 degrees, while the highs in central and southern Taiwan are expected to stay little changed from a day earlier at 25-27 degrees.
At night, temperatures could fall about 10 degrees around Taiwan, the CWB said, warning of a big day-night temperature gap.
Early Wednesday morning, temperatures in low-lying areas fell as low as 10.1 degrees at the CWB's monitoring station in Neimen in Kaohsiung and 10.3 degrees in Chungliao in Nantou County, Yujing in Tainan, and Baoshan in Hsinchu County, CWB data showed.
The CWB said cloud cover in northern and northeastern Taiwan is expected to increase during the day, increasing the chances of rain, and it forecast sporadic showers for Keelung and the nearby coast, and mountainous areas in Taipei, New Taipei and Yilan County.
Elsewhere, cloudy to sunny skies are expected to continue in central and southern Taiwan, the CWB said.
The Environmental Protection Administration said, meanwhile, that air quality would be generally good in Yilan, Hualien and Taitung counties in the east on Wednesday, while fair air quality was expected in northern and central Taiwan.
In the south, the air quality was forecast to be on the borderline between "fair" and "unhealthy for sensitive groups," with several monitoring stations in Tainan and the northern half of Kaohsiung showing alerts for unhealthy air for sensitive groups as of 10 a.m.