This has been happening to our truck too, since early June. We've just taken to carrying a box of fuses in the console.
He'll try these steps to see if ONE side or the other window motor is causing the windows & dome light fuse under the dash to quit working. He'll also check to see if the wires running along the upright are worn.
sometimes, they'll work for a few days after the fuse replacement, other times, the fuse will blow the second you put it in the fuse panel.
It did NOT start occuring due to rain. We remember the first time it blew, and it was very warm that day, and no rain.
He hardly drives it anymore, but when he does, you can bet money, the fuse will blow.