Perseid meteors, which come out from the constellation Perseus, dazzle the night sky on the eastern horizon between August 10 to 14 of every year, astronomers have said. However, rains and cloudy skies brought by a low pressure area (LPA) near Visayas may obstruct the view of the annual meteor shower which will occur until early dawn Thursday, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) said.

In an article posted on its website, PAGASA Administrator Prisco Nilo said that stargazers may see around 50 to 100 meteors per hour with the naked eye if the skies are clear during Perseids meteor showers which are expected to happen every night until dawn on Friday.

But on its weather bulletin posted at 5 a.m. Wednesday, PAGASA said that the LPA spotted at about 450 kilometers east of Visayas might bring cloudy skies and rains to some parts of the country, which could block the visibility of the meteor shower.

"Central and Southern Luzon, Visayas and Mindanao will experience mostly cloudy skies with scattered rainshowers and thunderstorms," the weather bureau said, citing data gathered as of 2 a.m. Wednesday.

On Tuesday, PAGASA meteorologist Jose Mendoza IV announced that the Perseid meteor shower will be visible at its peak across the archipelago every night at 10 p.m. until dawn on Friday.

But Mendoza clarified that the meteor shower would be harder to find considering that the skies in Metro Manila and most cities in the country are blocked by smog and pollution, dimming the chances of watchers to see the treat.

“Meteors are easiest to see if there is no moonlight and light pollution at all. Meteors in a shower appear to come from one area of the sky," PAGASA said.

Astronomers said that the Perseid meteor shower occurs every summer when the Earth's orbit crosses the path of debris thrown off by Comet Swift-Tuttle, an event that has been observed for about 2000 years.