When selecting wood for an outdoor bench that must brave rainy seasons, durability and natural weather resistance are paramount. The best choices are woods that inherently resist moisture, rot, and insect damage.
Teak is often considered the gold standard. Its high natural oil content makes it incredibly water-resistant and durable for decades, requiring minimal maintenance. Its weathering to a elegant silver-gray patina is a bonus for many.
Western Red Cedar is a superb North American option. It contains natural oils and tannins that repel water and decay. While slightly softer than teak, it's lightweight, easy to work with, and has a beautiful, aromatic grain.
For a budget-friendly yet durable choice, Pressure-Treated Pine is excellent. The chemical treatment process forces preservatives deep into the wood, making it highly resistant to rot and insects. It requires sealing or painting for optimal longevity and appearance.
Other notable mentions include dense, rot-resistant Ipe (Brazilian Walnut) and modified woods like thermally treated ash or acetylated wood (e.g., Accoya), which offer enhanced stability.
Regardless of your choice, proper construction with waterproof joinery and regular maintenance with a quality sealant will significantly extend your bench's life through countless rainy seasons.