Setup a spreadsheet to show how many months it takes to payback the refi costs at today's rates. Then see how much lower the rates would have to go for the payback to be a reasonable number of months again. If you don't think the second one is going to happen, maybe wait for a bit lower before doing a refi, but who knows if it'll go lower.

Other things to consider right now. If your job goes away, and it's hard to pay your mortgage, it might be better to be on an existing loan and not a new loan.