A frontal system, or the boundary between cold and hot air masses, will bring in the rains over parts of Luzon on Wednesday, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration.
Metro Manila may experience rains late in the afternoon. It is mostly cloudy with a heat index reaching 37 degrees Celsius.
Rains will be exacerbated by southwesterly winds, causing Batanes and Babuyan Islands to have cloudy skies with rains. Flash floods or landslides may result.
Zambales and Bataan are expected to have scattered rain showers and thunderstorms.
The rest of the country will have partly cloudy to cloudy skies with isolated rain showers or thunderstorms.