Water on passenger side floor after a rain, do not know where it is coming from.windows are closed. Any ideas?

 

that sounds to me that the seal around your windshield is leaking and needs to be resealed. Most people think that the sealer will last as long as the car does and that's just not the case. some people have their windshields replaced and the new sealant isn't sealed due to the owners getting in and out of the car and the pressure from the door being shut causes the sealant to expand. that is why it is important to leave the car with the glass shop for at least a full day