The northeast monsoon, locally known as “amihan,” has officially arrived in the Philippines, ushering in the cooler and drier months of the year.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) announced on Monday that recent weather patterns indicate the onset of the Amihan season.

According to the agency, the development of a high-pressure area over East Asia has strengthened northeasterly winds affecting Extreme Northern Luzon — a key sign that the Amihan has begun.

PAGASA added that rising atmospheric pressure and the gradual cooling of the environment are clear indicators of the seasonal shift.

“Forecasts indicate successive surges of the monsoon over the next two weeks that may cause rough sea conditions over the seaboards of Northern Luzon,” PAGASA said in a statement.

During the Amihan season, cooler and drier air will prevail across most parts of the country, occasionally bringing cold temperature surges and breezy weather, especially in the early mornings and evenings.

The weather bureau also warned of rough sea conditions and possible shear line formations, which could affect coastal and maritime activities throughout the season.

PAGASA advised the public and fisherfolk to stay alert for weather advisories as Amihan strengthens in the coming weeks.