A vigorous cold front will cause a return to winter-like conditions early next week, with some places possibly seeing their coldest pair of days this late in the warming season in decades. September begun quite cold across many parts of the southeast and apart from a warm spell mid-way through the month, it has stayed that way. Whilst mild conditions will affect most areas this weekend ahead of the front (except the eastern seaboard), things are set to become much colder. The front will bring a blast of cold not felt this late in the year in decades for places and will be accompanied by bitterly cold winds, making it feel 3-5 degrees colder than the mercury suggests. The front will reach Adelaide, Melbourne and Hobart on Monday, before reaching Canberra and Sydney on Tuesday, with the coldest conditions will be in southern and eastern areas. Melbourne is only forecast to reach 13 degrees on both Tuesday and Wednesday, the coldest pair of days this late in the warming season since 1984. Hobart will only reach 10 degrees on Tuesday, five degrees below the September average. Sydney will reach around 17 degrees on both Wednesday and Thursday, which would be the coldest pair of days this late in warming season since 2009. However, blustery southerly winds on both days will make it feel as much as 4-5 degrees colder in coastal suburbs. Looking further ahead, conditions will become warmer later in the month as warmth builds ahead of a low pressure trough.