Yes, these street benches do have a non-slip surface designed to handle rainy conditions. The seating surface is finished with a lightly textured, weather-resistant coating rather than a smooth or glossy paint. That texture gives your shoes and hands better grip when the bench is wet, which is exactly what you want during drizzle or after rain.
The material also helps. Most of these benches use powder-coated steel, treated hardwood, or recycled plastic lumber with a grained or matte face. Water tends to bead and run off instead of forming a slick film. Some models even include small drainage channels or slats that let rainwater pass through quickly.
That said, no outdoor bench can be 100% slip-proof in every condition. During heavy rain, a thin layer of water may still sit on the surface until it drains or evaporates. The non-slip texture reduces the risk significantly, but it is still smart to wipe the seat before sitting if it has been exposed to a downpour.
For areas that stay damp, look for versions labeled anti-slip, all-weather, or wet-area safe. These will have a coarser texture and better drainage. Overall, if you are asking about everyday rainy use, the answer is yes — these benches are built to stay safer and more grippy than standard smooth outdoor seating.