2015 Prius C driver floor is wet any hell what to check ?

Hello all my 2015 Prius c driver side floor carpet is wet : it’s been raining hard in Florida last 3 days . I have had this car 2 months and no problems and this just start happening . Althought there was no rain in last 40+ hours and it’s been extremely hot out , but today I notice water on the floor. Is tk ac drain lines or water coming from underneath? Kindly suggest if anyone knows about this problems so I can diagnose it myself I am in no position to spend hundreds of $$ at dealership at this moment unfortunately . Thank you so much in advance