Farewell to last days of summer as Autumn frost arrives It will be a very cold night for this time of year, and although it should stay dry there is a risk of frost in parts of the UK. There will be lows of 1 degree centrigrade in Aviemore, 3 degrees in Hawick and Keswick and 5 degrees in Melton Mowbray. Saturday will be a classic bright, cool, autumnal day. It will stay mostly dry with sunny spells, but as the day goes on showers may start to sweep into Cornwall. On Sunday those showers will be more widespread, with a band of heavy rain sweeping the country and even the risk of the odd thunderstorm. There are severe weather warnings in place for southern England on Sunday and much of southern and eastern England on Monday, with warnings of heavy rain and wind, as wet weather spreads north from the Bay of Biscay. Scotland and Northern Ireland should stay dry and fine, but may see rain later on in the day. The rain should continue into next week with prolonged showers on Monday and Tuesday, as Britain enters a period of unsettled weather and cooler temperatures.