Fans were hopeful the weathermen might have got it wrong. But they were sadly disappointed.
Forecasters had warned that severe weather which caused havoc across England on Friday was heading for Scotland, and torrential rain duly arrived for the 85,000 gathered at Balado, Kinross, to enjoy yesterday's acts including headliners The Stone Roses.
The Met Office updated weather warnings to amber status, warning much of Scotland to be ready for extreme conditions, and the Scottish Environment Protection Agency issued flood alerts for most of Scotland upgraded to flood warnings for Edinburgh, the Lothians and the Borders, saying heavy and persistent rainfall for Friday night and through Saturday, would lead to flooding in some parts.
In Balado, forecasters predicted the wettest day of the weekend's torrential rain. They were right – sheets of rain arrived from yesterday morning turning campsites and the arena into a muddy quagmire.
For the fans wellies and rain ponchos were the order of the day. Tayside Police warned drivers heading for T in the Park to take extra care because of heavy rain and surface water on roads.
With a capacity of 85,000 people each day, the event is said to be more populated than any city centre in Scotland and while some were determined they were not going to let the weather ruin their festival, others were transparently depressed.
Dripping wet biology student Annette Sinclair, 23, from Dundee who was at her first music festival doubted she would be back after her tent fell down overnight when drunken revellers stumbled into it.
"I had to share with some friends," she said. "The tent is dead ... just surrounded by mud. It's my first festival and I knew the risks, but nothing could be prepare me for this. You could easily swim in the mud in some parts. I am really not enjoying the conditions one bit. It's just not fun. I would rather be at home on the couch beside my dog Paw watching it on the telly."
T in the Park organisers warned revellers yesterday morning to "remember to prepare for all weathers – bring your wellies and suncream".
Politics degree student Josie Buchan, 22, from Stonehaven, testified to the wisdom of the advice. She got sunburned on Friday only to be faced with yesterday's heavy rain.
"I know we have crazy weather but really, having to come prepared for mud and the possibility of getting burned by the sun is beyond belief. But that's Scottish weather for you.
"I did pack suncream, but never brought it from the campsite on to the arena. Which is stupid of me. I might have a bit of a red face and my right leg is crimson, but having a great time. Maybe I will dive into some mud. It will cover up the sore bits and it's good for the skin."
Shop assistant Margaret Feeney, 28, from Stirling, was dressed in a red bikini – caked in mud. "I don't care," she said. "It's T in the Park. Look, it's raining, you can't mope about. I work nine to five and this weekend is about partying. No rain is going to stop me if it is not going to stop the festival."
She claimed she dived into a huge puddle of mud as a dare. "I am prepared. I bought some pink wellies and spent £50 on waterproofs but they're in the tent. And before you ask, I have a change of clothing."
For The Stone Roses, who have only played Scotland five times, the conditions failed to dampen spirits despite rain appearing to follow them during their reformation tour. They played a sodden Heaton Park for their Manchester homecoming gigs but, as in Balado, the rain didn't dampen fans enthusiasm.
Their triumphant return came 17 years after their last appearance in Scotland when they did two nights at the Barrowlands, Glasgow, in 1995 during the Second Coming album tour.
Meanwhile, weather forecasters locally were predicting that the rain would ease today for the main attractions Kasabian, Happy Mondays, Nicki Minaj, Keane and Elbow.
It emerged yesterday that one teenager was banned from the festival after he was allegedly caught dealing drugs. Thomas Baker, 18, from Liverpool, appeared at Perth Sheriff Court on Friday to deny dealing ecstasy and possessing cannabis. He was arrested on Thursday, before the first band had even taken to the stage.
Sheriff Lindsay Foulis freed Baker on bail but banned him from returning to T in the Park. He will face trial in October this year.
T in the Park festival organisers want to try to top the reforming of The Stone Roses who headlined last night, as they prepare for the festival's 20th anniversary next year.
Organiser Geoff Ellis, who described securing The Stone Roses as a dream come true, said he would like to secure a number of big Scottish acts.
"We want to have the best Scottish bands that are around, it's something we're always looking to reflect. But we've got to look beyond Scotland. We sell tickets in England, we sell tickets everywhere, we need to have standout artists.
"I'm not saying we'd never have a Scottish headliner, we've had them in the past and we're already talking to some Scottish bands about playing next year."
He has said he would be "very interested" in booking legendary 80s indie band The Smiths if they were to reform.
The problem is they split in 1987 and have, like The Stone Roses previously, shown no signs of getting back together, although there is the lure of filthy lucre. "I'd be very interested. If it happened, I'd definitely be very interested. But you've got to get the feedback from the audience before you book and find out if they suit our core audience," he said.
"The Stone Roses suited that perfectly, but maybe The Smiths are not seen the same way by 18 to 25-year-olds as the Roses, but we'd still love to put them on.
"You can't get a band like The Stone Roses to reform every year, a band that's liked by 18 to 25-year-olds now, as well as people who were into them in the 1990s.
"We'd love to get The Stone Roses mark two next year ... whoever they are."