The UK can look forward to “one last blast of summer” next week, with temperatures forecast to climb above 30C (86F). The mercury could hit 31C in southern England on Tuesday, however parts of Scotland can expect torrential downpours this weekend that could bring almost a month’s worth of rain in just one day. According to the Met Office forecaster Bonnie Diamond, the “tropical continental air pushing up from a southerly direction in combination with light winds” will lead to temperatures of up to 25C on Sunday and 29C on Monday. The hot weather could remain on Wednesday but thunderstorms are possible. “It definitely feels like one last blast of summer, even though we are, meteorologically speaking, in autumn,” she said. The warm September follows an August heatwave, when temperatures passed 34C for six consecutive days. The highest September temperature ever recorded in the UK was 35.6C on 2 September 1906, but “they don’t look like they are going to come anywhere close to that in this current hot spell”, the forecaster said. After a sunny Saturday across the country, the evening will bring rain to parts of western and north-western Scotland for at least 24 hours. A yellow weather warning has been issued for the region on Saturday and Sunday, advising that there could be floods and communities could cut be off as 150mm of rainfall is expected. The average total rain for the region in September is 155.9mm. South of the border, Diamond described the weekend’s weather as “pretty decent” with high pressure in charge. “We’re looking at a mostly dry weekend away from north-west Scotland with the promise of sunshine.”