Manchester City celebrated their treble of major trophies with an open top bus procession around the city centre in front of tens of thousands of fans on Tuesday (AEST), accompanied by champagne and rain.

The start of the evening parade was delayed because of what City called “adverse weather conditions and lightning storms” but two blue buses — complete with the Premier League, FA Cup and Champions League trophies aboard — eventually wound their way through the city streets, with the players and cigar smoking manager Pep Guardiola wearing T-shirts bearing the words “Treble Winners.”

“It had to be the best parade with this rain, otherwise this is not Manchester,” Guardiola said after the squad reached a stage on St Peter’s Square in the middle of Manchester, led by a shirtless Erling Haaland and Ruben Dias with three medals around his neck.

“We don’t want sunshine, we want rain, so it was perfect.”

City defeated Inter Milan 1-0 in the Champions League final in Istanbul on Sunday (AEST) to clinch the treble and emulate the success of Manchester United’s 1998-99 squad.

City won their first Champions League trophy, fifth Premier League title in six years, and second FA Cup under Guardiola’s seven-year tenure.

Rodri celebrates with Erling Haaland and Ruben Dias of Manchester City. (Getty)

It has been one long party since City returned from Istanbul on Monday (AEST) and the celebrations were far from over.

“For the past 24 hours I’ve had the best day and night,” City winger Jack Grealish said.

“To be fair, I don’t think I’ve had any sleep.”

Just over a week after the FA Cup victory, Elton John, the 76-year-old pop icon, ran into City players on the tarmac at the Manchester airport, he responded with a video.

Players had serenaded John by signing “Your Song.”

“You did it, I’m so happy and thrilled for you all,” John said.

Manchester City celebrate on the open top bus as fans line the streets. (Getty)

“What a season, what an achievement.

“Enjoy the celebrations in Manchester, you deserve it.”