Does the leakage smell like coolant if so most likely the heater core, if it is just plain water the evaporator core, and heater core box could have a leak from being cracked letting the condensation leak into the floor especially if the evaporator drain tube is clogged. If it only does it when it rains well roll all the windows up shut doors run a water hose all over where there is wheather strippping to see if it seeps in.
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