Closer Pets’ cat flaps are as weatherproof as it is possible to be. We have to balance making the cat flap easy to use for a cat while also providing enough resistance to keep weather out.
For that we use a simple, reliable magnetic closure which has enough strength to keep the weather out while being easy to use for cats.
It won’t keep all weather out, especially if the door is in an exposed place but it should keep the majority of average British weather at bay.