Jeff Bezos and Lauren Sanchez made it crystal clear no grumpy locals were gonna rain on their parade … but Mother Nature had other plans, literally soaking them before their big “I do.”

Catch the clip … Jeff and Lauren got hit with a serious downpour after their Italian rehearsal dinner bash Thursday — the billionaire holding onto his bride-to-be with one hand and sporting an umbrella in the other as they scrambled to a water taxi.

There were a bunch of security guards hovering to make sure the soggy dash went off without a hitch — but all good, Jeff and Lauren looked totally chill as they kept the party going.

Luckily for them, the worst of the storm has passed — and the forecast’s lookin’ fab for days ahead.