Much of South Australia, Victoria, Tasmania, the ACT and New South Wales are having their last spell of warm weather until spring. Temperatures are rising five to 10 degrees above the April average as northerly winds combine with sunshine ahead of a cooler change. Melbourne is in a four-day warm spell that is almost certainly not going to be repeated until spring. After reaching 26 in the last two days and with similar maximums forecast on Friday and Saturday, Melbourne is also having its longest spell of days above 25 degrees since mid-February. On Friday Adelaide is likely to reach 30 degrees and Hobart 25 for the second day running. This will almost certainly not happen again until spring. Canberra and Sydney will have their warmest days on the weekend, in what might be the warmest weekend for the rest of the season. For those working on Friday, it's the sort of day to be spent outside at lunchtime. For those not working it may be a good idea to get some washing done before a colder change arrives on the weekend.