Big Sean Stage Suffers $60,000 Washout!

5/8/2017 1:56 PM PDT

Big Sean's Stage Suffers $60,000 Washout

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Big Sean's latest concert was extremely expensive -- not for fans -- but for the bottom line on his tour ... after a downpour seriously damaged his stage.

Sean was a headliner at the Power 106 Powerhouse show in San Bernardino, CA -- along with Lil Wayne and DJ Khaled Saturday -- when a freak storm hit the outdoor venue. His video wall, which is a big part of his act, was drenched ... and after a 30 minute delay ... Sean had to carry on without it.

We're told damages are expected to run about $60k -- it's a big TV, after all.

Here's the screen in better days ...