Heavy rainfall and strong winds were brought by a Low Pressure Area and subsequent tropical cyclones. The trough of the Low Pressure Area initially caused flash floods in one city. It later developed into Tropical Depression Luis, which led to flooding in low-lying areas and rough sea conditions.

Further effects of the combined weather systems were felt in various regions, including the Cagayan Valley Region, La Union, and Pangasinan. These areas experienced moderate to heavy rainfall and resulting floods. Details of the situation are available in a report from the DSWD DROMIC, which provides an overview of the effects of the weather systems as of 07 September 2026.