 Weather in the Philippines is monitored and managed by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).Monsoons are large-scale sea breezes which occur when the temperature on land is significantly warmer or cooler than the temperature of the ocean.Most summer monsoons or southwest monsoons () have a dominant westerly component and a strong tendency to ascend and produce copious amounts of rain (because of the condensation of water vapor in the rising air).