Short answer: usually, no. If you're evacuating ahead of a hurricane, the safest move is to bring urban outdoor furniture inside or secure it as if it could become a projectile. A balcony in a city, especially in a high-rise, can turn into a wind tunnel. Lightweight chairs, side tables, cushions, umbrellas, and planters can be picked up and thrown against glass doors, railings, neighboring units, or people below. Even heavier pieces like metal tables or benches can slide, flip, or break apart in extreme wind.
If you have time before you leave, prioritize the loose stuff. Bring in cushions, umbrellas, small chairs, decorative items, and anything that can be carried with one hand. Move heavier furniture indoors if you can do it quickly and safely. Close and lock balcony doors. If your building allows it and you have proper anchors, strap down what cannot be moved, but don't rely on a rope tied to a railing. Most residential ropes and bungee cords are not rated for hurricane-force winds.
What if you're under a mandatory evacuation order and cannot move everything? Leave anyway. Do not stay on a balcony during a storm to move furniture. Your life is worth more than a patio set. If there is truly no time, remove the most dangerous items, lower umbrellas, and leave the rest. Accept that some damage may happen. You can replace furniture; you cannot replace a person.
Also check your building's rules. Many urban buildings require balconies to be cleared before a storm. If you have a grill or propane tank, never leave it on a balcony during a hurricane evacuation. Propane can turn a small wind problem into a fire or explosion risk.
After the storm, don't rush back onto the balcony. Inspect for cracks, loose railings, broken glass, and shifted furniture. If anything looks unsafe, wait for building management or a professional to check it.
So: can urban outdoor furniture be left on a balcony during a hurricane evacuation? Technically, yes, it can be left. But should it be? Usually not. If you can move it inside, do that. If you can't, secure what you can and evacuate. The best hurricane prep for a balcony is a boring one: clear it, lock it, and go.