Australia could see the first 40 degree day of the season this week as spring warmth starts to take hold across the country. Temperatures usually climb in Australia at this time of year, as the sun moves progressively higher into the sky. This intensifying sunshine and little, if any, cloud causes the mercury to soar most notably in the tropics. It has been four months since any location in Australia reached 40 degrees, but this week looks to end that cool run. Fitzroy Crossing in Western Australia's Kimberley is tipped to reach 40 degrees on Thursday for the first time since May. Some locations may see their hottest day in five months. This includes Darwin, which is forecast to reach 36 degrees today and Kununurra in WA, expecting a top of 39 degrees on Thursday. Many other locations across the country are expected to have their warmest weather since May this week, including Hobart, Melbourne and Canberra. If we do reach the mark this before 14th September, it will be the earliest 40 degree day in three years. The earliest 40 degree day on record for the warming season occurred on 27th August 1970 in Kalumburu, WA. Australia's hottest day during September was 43.1 degrees at West Roebuck in 2003. The country's hottest temperature ever recorded was a scorching 50.7 degrees at Oodnadatta back in 1960. This week's early-season heat almost seems cool by comparison.