It will be a weekend of two halves in Melbourne as the strongest cold front so far this season crosses Victoria on Sunday. Saturday will be unseasonably warm as northwesterly winds freshen across the state ahead of the approaching front. Temperatures are expected to reach the mid to high twenties in most areas and above 30 degrees in the north, which is 5-8 degrees above average for this time of year in Victoria. After a summer-like Saturday, a blast of wintry weather will close out the weekend. The cooling is going to be significant and will occur in two stages. Firstly, a pre-frontal trough will cause showers to drop temperatures by a few degrees in western Victoria during Saturday morning followed by central and eastern districts during the afternoon and evening. Overall, it will stay warm despite brief cooler period during these showers. The second and more noticeable drop in temperatures will occur as the strong cold front crosses the state on Sunday morning. There is still some uncertainty regarding the timing of the change, although it will most likely reach the state's southwest early in the morning and central areas before midday. A strengthening flow of southerly winds behind the front will bring the coldest weather on Sunday. Temperatures are likely to be in the teens for most of the state in Sunday, although wind chill will make it feel particularly nippy. Temperatures are expected to cool by 10-15 degrees across the state from Saturday to Sunday, even more when wind chill is taken into account. This type of temperature drop has not been felt since last cold season. Some of the notable expected temperature contrasts between maximums on Saturday and Sunday include Ouyen (32C to 19C), Mortlake (28C to 15C) and Ballarat (25C to 13C). While Melbourne is forecast to drop from 27 degrees to 17 degrees between the two days, Sunday's maximum will be early in the day and the afternoon may feel close to 10 degrees at times due to wind chill. Rain will exacerbate the wintry feel across the state on Sunday. Showers are likely in all districts, although the heaviest falls are likely on and south of the ranges, including the North East District. Some areas may see isolated falls of 20-40mm in 24 hours. It will be cold enough for snow to settle on mountains above about 1100 metres between Sunday afternoon and Monday morning. The higher peaks in the state's northeast could see around 10 centimetres of snow, possibly more. Cool and windy conditions will linger into the start of next week as a low pressure systems spins up in the Tasman Sea. The mercury should bounce back in the middle of the week as the low moves further away.