Window installation after it rains

I'm scheduled to have a combination of Simonton replacement and new construction windows installed tomorrow. The forecast calls for rain tonight. Tomorrow is supposed to be clear. Should I postpone the installation? I'm not terribly familiar with the installation procedure, but I'm concerned about the caulk adhesion.

Thanks!

I wouldn't be too concerned. Once your old windows are removed that area will be dry and as long as the brickmold is painted, it will resist water also.