If it's going to be super rainy, your soil could be washed out. All your fertilizer gone with the flush ( rain) .
People would cover the pots to avoid this washing of the nutrients in the pot.
But:
I always thought that the roots could suffocate from lack of air exchange at the roots/potting medium and from constant humidity. IMO, roots need to dry a bit every now and then.
Those kind of setups always reminded me of a pressure cooker ... I don't want to cook the roots ...
Potting medium in the dark tend to develop moisture (white airy lines) /mushrooms - and that's not good for the roots IMO .
I never cover my pots. But I admit that only have a few, and here the weather is not that rainy.
If you were in a place with daily rains ... You should probably try and do something to keep some water out of the dirt of the pots.