London is set to be hotter than Ibiza, Mykonos and Kos as the capital could see a week of uninterrupted sunshine.Next week could see the hottest day of the year so far as temperatures are expected to steadily rise to 21C in London by Thursday, making the capital warmer than a number of popular holiday destinations.The streets of London could be warmer than the idyllic beaches on the Greek islands of Mykonos and Kos, which are expecting cloudier weather and temperatures of around 18 or 19C throughout the week.Temperatures on the Spanish party island of Ibiza are expected to remain in the mid-teens next week, but the mercury will jump to 18C in London on Sunday, with only a few clouds expected all week.Temperatures could reach 20C as soon as next Wednesday and creep up to 21C on Thursday and Friday, the Met Office has forecast.The forecaster has said London could bask in sunshine as soon as 10am on Friday, and despite some cloud cover predicted on Monday, the conditions may stay all week.