Rain deflector apparatus and system

A rain deflector apparatus comprising:

• a plurality of panels including a central panel and at least one additional panel, the panels being configured to telescope relative to one another to adjust a width of the rain deflector apparatus;
• each of the panels including a main body having a front face, a back face, and a thickness defining a top edge, a bottom edge, a right edge, and a left edge;
• a bottom seal portion extending from the bottom edge of each of the panels;
• a top sealing surface portion disposed adjacent to the top edge of each of the panels;
• one or more attachment mechanisms disposed on the back face of at least one of the panels between the top sealing surface portion and the bottom seal portion;
• and
• mating features configured to constrain relative movement between the panels with respect to the top edges and the bottom edges while permitting longitudinal translation of the panels relative to one another;
• wherein the rain deflector apparatus is configurable to be secured to a structure such that the bottom seal portion and the top sealing surface portion engage corresponding surfaces to reduce intrusion of water.