kittens and rain

Hi there. I have a question regarding kittens and rain!
I am fostering 3 orphaned kittens on my balcony, and today was their first rainy day!

I am worried about them. Will they cold or sick or anything?

I can't get them inside because my own cat absolutely hates them. She is very violent as well. And on top of that just last week we started dealing with a bleeding tumour! So she is already going through a lot. My family is looking for an excuse to send them away so taking them inside is a no go....poor kittens.

It is 4am here, the sound of the rain fling woke me up. It is usually their dawn-play time. I found them sitting on the floor on some clothes they have but their wars and paws were cold. They haf very few rain drops on ther tails.

The balcony is safe it won't get wet or flooded and they have at least 3 places to hide and be warm (with isolator blankets).

It is not very cold just not warm...

Am I unnecessarily panicking? Or do I need to worry about anything?

They are 3 months old now.

Thanks

They need a dry, clean place to stay.  Is there a way to bring them inside and put them in your bathroom or laundry room?  They will get sick if they aren't in a dry place.