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The storm, which is sweeping in from the Atlantic, has already hit areas of the UK including the hamlet of Katesbridge, Northern Ireland, where temperatures plunged down to 0.30C.
Meanwhile, it was a damp day for festival-goers at the Boardmasters festival in Newquay, as torrential rain swept across Cornwall and the South West of England. Sounds like it's another wet weekend for music fans at Boardmasters who were hit with similar weather last year.
If you thought you were safe from Storm Debby's wrath, this is reportedly only the beginning. The Mirror reports that downpours are forecasted across England and Scotland today and unsettled weather is expected to continue with heavy rain on Wednesday.
Met Office forecaster Greg Dewhurst said: "While it is not going to be a complete washout, it is going to be really unsettled for the next couple of weeks or so.
"There will be some brighter spells in the south and south east, but also the risk of heavy rain across northern and western parts of the country."
Well, at least we have had a good run of record-breaking sunny weather - Saturday's turnaround marked the end of a 47-day consecutive run of at least one area of the UK reaching above the 24C mark.
Of course, this change of weather doesn't spell the end of summer and aside from the rainy start, the rest of the week will still see some sunny spells.
Greg added: "Although there is not a strong signal it will get back into the 30s this August, the temperatures could hit the mid twenties in the south east.
"To be honest it is pretty normal weather for this time of the year. It is just that we have been spoiled so far this summer."
Damn straight, we have.
Now that Storm Debby's hit, it's business as usual as the UK returns to the dreary, rainy skies we've grown accustomed to. No doubt we'll still moan about it just as much as we did during the heatwave. It's what we do best.
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