Web alarm clock for 1:59 p.m.
You have only just woken when a hard midday rain starts drumming on the roof, so set the alarm for 1:59 pm before doing anything else. It gives you a clear cue to get up and close the shutters as the clock reaches 2:00 pm, rather than noticing the spray only after it has blown indoors.
Your shutter check should not be the first time you hear this browser alarm. Try its sound now, while you can still adjust the volume and confirm that it is audible above rain, an electric fan, or an air-conditioner. Keep this page active and your phone awake: if you close the page or let the phone sleep, the shutter reminder may make no sound, leaving the windows exposed when the downpour strengthens.
Once the shutters are secured, keep a small buffer before your next commitment that afternoon. A sudden Philippine shower can leave damp floors, wet window ledges, or items near the sill that need attention. Use a few minutes after 2:00 pm to wipe up any spray, move soaked footwear aside, and check the rooms facing the wind. That leaves your later plans intact instead of turning one quick task into a rushed transition.