Why would the driver's side floorboard be wet when it has not rained?

A wet driver's side floorboard could be due to several reasons, such as a leak in the vehicle's windshield seal or door seals, allowing water to enter during washing or through condensation. It could also result from a clogged or damaged AC drain, causing condensation to overflow into the cabin. Additionally, a spill or wet items placed in the footwell could be the culprit. Checking for these issues can help identify the source of the moisture.