A weep sill assembly includes an elongated sill base, a first floor within the sill base, and a drain conduit. The elongated sill base includes a top opening configured for fluid ingress. The first floor divides an interior of the sill base into an upper chamber and a lower chamber, wherein the floor includes a first aperture that provides fluid communication between the upper chamber and the lower chamber. The drain conduit is in fluid communication with the lower chamber. In another aspect, a sliding door assembly includes a header configured for attachment to a wall, a weep sill assembly, and a door panel configured for slidable engagement with the header and with the weep sill assembly.