West side of my house gets no shade. In trials, shading it reduced outside wall temp by 40^ on a typical sunny August day, 15-20 inside wall. (That's brutal sunlight, folks.)
I've hung a cheap silver tarp like a mural on that wall ever since. Costs me ~$20 every 2-3 years (wind shreds 'em) I buy 8 1/2' x 11 1/2' to have grommets on both long sides and a 'drop fit'. A large enough one could could be cut up. Most home sewing machines will stitch 4 plys of HFT tarp easily if you make your own covers.
Call a 'tent & tarp' shop if you have one local. Sunbrella (TM) or other polyester (boat cover grade) would last the longest of breathable mat'ls, and likely cost the most. UV kills stuff that laughs at weather extremes. Formula 303 is also my pick for slather-on protection of tires, vinyl, patio furniture, paint, recoil pads ...