Before the First Heavy Rain
Pre-monsoon structural checks focus on anything that could trap or channel water against a structural member: exposed rebar cages awaiting a pour, open construction joints without waterstops, and temporary shoring whose footing hasn't been checked for scour risk. A site walk before the first heavy rain, with a punch list closed out rather than just noted, is far cheaper than a post-storm repair.
During an Active Monsoon Spell
Once the rains are running, the checks shift to drainage and load: are site drains actually carrying water away from footings and retaining structures, is backfill against basement walls seeing standing water it wasn't designed for, and is any temporary shoring or scaffolding showing settlement after saturated ground softens underneath it. These are daily checks during an active spell, not weekly ones.
After the Rains Clear
Post-monsoon inspection should treat every exposed structural element the same way a defects walk would: check for new cracking in recently cast concrete, verify that curing wasn't disrupted in a way that affects strength, and re-survey any temporary works for movement. Documenting this inspection against the pre-monsoon baseline is what lets a team tell the difference between cosmetic weathering and a real structural concern.