MINNEAPOLIS — Dave Matthews Band crashed into a midsummer Minnesota rain deluge, forcing the summer jammers to postpone their concert Tuesday night at Mystic Lake Amphitheater.

The performance was only the third show of the new Shakopee venue’s inaugural season — and its biggest one so far. The concert has already been rebooked for Aug. 31. Tickets to Tuesday’s gig will be honored on the new date.

Concertgoers were already lined up in traffic outside the 19,000-person amphitheater when it was announced the concert would be delayed by an hour. Then just before 7 p.m., promoter Live Nation declared the postponement via social media and outside the venue’s gates, where thousands of rain-jacket-clad fans were waiting outside.

“Due to ongoing inclement weather, we made the difficult decision to postpone tonight’s show,” the venue’s operators posted via social media.

Some fans were surprised by the announcement, since steady but not heavy rain appeared to be the only issue around showtime, not thunderstorms or high winds.

“What happened to ‘rain or shine?’” one fan, Jim Haugen, complained under the X post. Another tweeted, “Uhh, it’s perfectly fine outside.”

Earlier in the day, the local office of the National Weather Service gave a hazardous weather outlook for portions of south-central and southeast Minnesota, saying thunderstorms were likely in the afternoon and evening.

Later in the evening, forecasters warned of strong thunderstorms with wind gusts up to 40 mph was likely to impact those further south near Owatonna.

A tornado warning was also issued for Kenyon, about an hour southeast of the venue.

Tuesday’s concert was close to being sold out. Between the large crowd and the venue’s new, inexperienced staff, the amphitheater brass likely was extra cautious about safety. Requests for comment from Live Nation representatives went unanswered.

The availability of Matthews and his crew was also undoubtedly a factor. They are due to play another newly built Live Nation outdoor venue, Morton Amphitheater near Kansas City, on Wednesday night. The Twin Cities postponement pushes their concert to compete with shows at the Minnesota State Fair and comes a few weeks ahead of Matthews’ annual appearance at Willie Nelson’s Farm Aid concert.

One upside of the postponement: The restaurants and bars near the new amphitheater were suddenly flooded with customers around 7:30 p.m.

“It’s like a busy weekend night all of sudden,” marveled a staffer who did not want to be named at Mana Brewing in downtown Shakopee.

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