When the weather is humid, grains are easy to get moldy. Is there any way to prevent it?

First of all, moldy things can't be eaten.

Secondly, before the rainy season comes, dry the moldy things and put them in sealed cans.

There are many sealed boxes in my house. Don't buy too much. When I get it back, I will live in a sealed box. In this way, there will generally be no mildew. It is also possible to separate various grains.

What's more, I bought too much grass when I was crazy about Tupperware. I regret it now and feel that there are many choices now. Glass jars, like those sold in supermarkets, hold things well. It's too wordy I hope it works for you.