After it rains my pathfinder belts squeaks for a good 5 mins. i figured its because of the rain but how do i fix it?

Check your harmonic balancer. The large center wheel that turns all the belts. The outer belt guides will often start to separate on these cars, pulling the belts, and causing squealing. Get under the vehicle and check that that all pulleys are perfectly aligned. If not, see if one of the rings on the balancer has slid forward or backward. If sliding away from the engine, you may be able to clean the rubber bushing beneath it with brake cleaner or similar product. Use rubber mallet to tap it back into place, then replace all belts. If it slips again, the balancer will need to be replaced. Figure $350 - $500 total cost. Check your harmonic balancer. The large center wheel that turns all the belts. The outer belt guides will often start to separate on these cars, pulling the belts, and causing squealing. Get under the vehicle and check that that all pulleys are perfectly aligned. If not, see if one of the rings on the balancer has slid forward or backward. If sliding away from the engine, you may be able to clean the rubber bushing beneath it with brake cleaner or similar product. Use rubber mallet to tap it back into place, then replace all belts. If it slips again, the balancer will need to be replaced. Figure $350 - $500 total cost.