Traders assign near-certainty to a 28°C high in Manila on August 13 due to persistent southwest monsoon conditions and scattered rains and thunderstorms that suppress daytime heating, consistent with PAGASA observations showing a recent maximum of 28.5°C under overcast skies. This aligns with official monitoring from the Philippine Atmospheric, Geophysical and Astronomical Services Administration, where cloud cover and precipitation reduce solar insolation and keep temperatures below the long-term August climatological average near 31°C. Tropical Storm Nangka, positioned outside the Philippine Area of Responsibility, further supports stable steering patterns favoring moisture and cooling. A realistic shift would require rapid clearing or delayed monsoon activity to push readings to 29°C or higher, though model consensus and current observations make such an outcome improbable before resolution.