Honestly, there’s no single weight for urban outdoor furniture. It ranges from lightweight café chairs around 8–15 pounds to heavy concrete benches and tables that can weigh 300–800 pounds or more. A typical metal patio chair might be 15–30 pounds, a wooden chair 25–50 pounds, and a mid-size table 40–150 pounds. Commercial rooftop furniture is often heavier and may have built-in ballast, but plenty of “urban” pieces are still designed to be movable.
Will it blow away on a windy rooftop? Possibly, yes—even if it’s fairly heavy. Rooftops are exposed, so wind speeds are higher and gusts can be much stronger than at street level. A 30-pound chair can slide or tumble in strong gusts; a lightweight table can flip; an open umbrella or fabric cover acts like a sail. A 100-pound table isn’t automatically safe either. If the surface is smooth and the wind gets under it, it can slide or tip.
The key isn’t just weight; it’s wind area, shape, surface friction, and anchoring. A heavy low bench with a solid base is much safer than a light chair with a big back. If you want to keep furniture on a rooftop, use proper anchors, weighted bases, tie-down straps, or ballast. Choose pieces rated for wind, close umbrellas, and bring cushions or lightweight items inside before storms. And check with the building about roof load limits and anchoring rules. If severe weather is coming, the safest move is to store the furniture indoors or in a secured storage area. If you can lift it easily, assume the wind can move it. If you can’t, it can still tip—so secure it anyway.