Glastonbury Festival founder Michael Eavis has said he is "absolutely chuffed" with the event's success.
Thousands of music fans have travelled to the site in Pilton, Somerset, carrying large backpacks of tents and belongings, or dragging laden trolleys behind them.
Many began their journey days before, with some choosing to sleep in their cars overnight to be among the first inside.
Campers were greeted by cloudy and damp weather when the gates opened at 8am, though sunshine and temperatures of up to 23C (73F) were expected later in the day.
The dairy farmer described the 2019 festival as "the best show we've ever done".
He was speaking after arriving at the premiere of Ibiza: The Silent Movie at Cineramageddon in a vintage car with Julien Temple and Fatboy Slim.
Fans cheered loudly and took photographs on their phones as the three entered the area, which features 60 vintage cars, repurposed funfair rides and a Learjet.
Mr Eavis said: "Thank you all for coming. It's going to be a fantastic weekend.
"It's the best show we've ever done, I promise you. And we've got fine weather as well.
"We appreciate you coming to our farm. No one is more excited than I am.
"Forty-nine years ago, it isn't bad going is it? And so many people want to come - it's so lovely.
"I'm absolutely chuffed."
The Julien Temple film is told through music directed by Fatboy Slim, aka Norman Cook.
After the showing, he will DJ a silent disco.