Foo Fighters fans are ready to go wild at this summer's biggest rock show - but they're likely to get wet and a little windy in the process.

The American rock act is here to play to more than 40,000 fans in South Auckland tonight, with fellow rockers Weezer and Wellington punks Ayn Randy in support.

But this week's uneven weather is set to play a part, with the Metservice warning an unpredictable low will cross Auckland right when Mt Smart Stadium's gates open at 4pm.

That means there's a risk of "heavy" showers falling before Dave Grohl and co hit the stage.

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Meteorologist Georgina Griffiths says it's unlikely the show will be marred by the kind of brutal weather that sent fans home cold and shivering when Adele performed in the same venue around the same time last year.

"I'd recommend people look at the radar before they leave their front door to see which part of auckland is raining the worst and which parts aren't," warned Griffiths.

She told fans to pack a raincoat, and warned it would be "quite windy".

"I'd say it's wet to start the concert and probably improves," she said.

The Foos are playing on the back of stellar reviews of their recent Australian shows, with Music Feeds calling it "more than a concert".

"It's an experience, a story about to unfold, and everyone has their own Foos moment they hold dear," the publication wrote.

Recent setlists shows they'll play plenty of hits, including Best of You, Everlong, Monkey Wrench and My Hero, as well as a handful of songs from their recent album, Concrete + Gold.

It will be their 10th visit here. They were last here playing the same venue in 2015.

KEY INFORMATION
TIMINGS: Gates open at 4pm, with Arn Randy starting at 5.40pm, Weezer at 6.30pm and the Foo Fighters at 8pm.
TRANSPORT: Tickets include free travel on event buses and trains. Check Auckland Transport's website for timings.
RESTRICTIONS: Organisers warn fans to expect wandings and pat downs at the door. They also ask to "leave bags at home". Only those measuring 200mm x 300mm x 200mm will be allowed in.
WEATHER: The concert will go ahead rain or shine. If rain is predicted, bring a poncho or raincoat as umbrellas are not permitted.