Why do ears itch when it rains?

It may be eczema of external auditory canal (for reference only). I thought the same thing.

The most important thing is to prevent water from entering the ear. After bathing and swimming, dry the external auditory canal with a cotton swab. Try not to pick the ear canal. I broke the yellow water, and the digging became more and more serious.

Pay attention to avoid eating seafood, spicy food and drinking alcohol when your ears itch, which will aggravate eczema.