TAIPEI (Taiwan News) — An average high of 30 degrees Celsius is forecast for all of Taiwan on Monday (May 4), with daytime highs expected to push above 35 degrees in Taipei, New Taipei, and mountainous areas and river valleys in the country's south, according to the Central Weather Bureau (CWB).

As warm weather prevails, the bureau warned that the ultraviolet (UV) index is expected to shoot up across most of the nation, putting people at risk of harmful sun exposure. In Hualien and Penghu Counties, the UV index will reach extreme levels.

While cloudy and sunny skies are forecast around Taiwan, afternoon showers are expected in mountainous areas, the CWB said, advising people wishing to take part in mountain activities to be alert to the possibility of sporadic downpours.

Air quality around Taiwan is expected to range from good to fair, though the north may experience high levels of pollution at night.

The bureau also warned of low visibility on the outlying islands of Kinmen and Matsu on Monday due to thick fog and low clouds, and it urged locals there to proceed with caution when going outdoors.

(CWB photo)