I’d treat this as a shade problem first and a furniture problem second. Direct sun heats the surface, and once that heat is stored, it takes ages to come back down. So the best fix is to block the sun before it hits the furniture.
For a balcony or small patio, a cantilever umbrella with a heavy base is often the easiest renter-friendly option. A shade sail secured to sturdy anchors or weighted bases works well on rooftops; a retractable awning or slatted pergola is great if you can install one. Even a simple balcony screen or movable parasol can take the edge off during peak hours. Position furniture so it’s shaded from late morning to mid-afternoon, and check wind safety—umbrellas and sails need proper anchoring.
Material and color choices matter. Light-colored, powder-coated aluminum tends to stay cooler than dark steel or dark plastic. Teak, HDPE resin, and quality wicker are good options, but even they get warm in direct sun. Avoid black metal, dark resin, and glass tabletops that can become uncomfortably hot; if you already have glass, use a light-colored tablecloth or keep it under an umbrella. If you’re buying new pieces, choose lighter finishes and breathable designs.
Cushions are a big one. Use light-colored, breathable, quick-dry outdoor fabrics—solution-dyed acrylic and mesh-backed cushions are good. Dark, thick cushions soak up heat and hold it. If you aren’t using the cushions, bring them inside or store them in a shaded box. A simple white towel over a hot seat can make it usable, but breathable reflective covers are better for longer periods. Avoid tight plastic covers during the day, because they can trap heat and condensation.
Add airflow and a little moisture. A misting fan or outdoor fan won’t cool the furniture itself, but it makes the space much more comfortable. Plants, especially tall or leafy ones, can create dappled shade and make a small urban space feel cooler. A light-colored outdoor rug can help underfoot, but check that it doesn’t get slippery when wet.
Finally, plan for peak sun. Move lightweight chairs and tables into shade during the hottest part of the day, rotate umbrellas, and keep surfaces clean so they reflect rather than absorb heat. If you can’t add permanent shade, combine a movable umbrella with breathable cushions and lighter furniture—that usually solves the problem without a big renovation.