The Weathered Copper Bars is the third oxidation stage of the Copper Bars, featuring a greenish tone with visible brown patches as the copper continues to corrode. It functions the same as the regular and exposed variants, serving as a decorative and semi-transparent block commonly used for fences, windows, and architectural detailing. Like other bar types, it connects smoothly to nearby bars, blocks, and fences, offering flexible design possibilities.

The Weathered Copper Bars can be obtained by allowing Exposed Copper Bars to oxidize further over time or by accessing it directly in creative mode. Applying Honeycomb to the block creates a Waxed Weathered Copper Bars, preserving its weathered look, while using an axe can revert it to an earlier oxidation stage. With a hardness of 5 and a blast resistance of 6, the Weathered Copper Bars provides a rustic green appearance without losing structural strength, making it perfect for builders who want a naturally aged copper aesthetic in their creations.