The Northern Territory and Western Australia have experienced warm nights and are about to have a very warm day today. A very warm air mass is covering the nation's north, with some areas experiencing their warmest night since summer. Many northern regions are heading to a hot day with temperatures increasing to the high 30s, prompting a fire danger warning to be issued for the West Kimberley Coast and Kimberley Inland in Western Australia. Dalemere's overnight temperature only dropped to 22.2 degrees, which is its highest since last February. At Victoria River Downs the mercury marked its highest minimum temperature since May with 22 degrees, which is 3.6 degrees above the September average. The daytime temperatures have a good chance of increasing to the high 30s over northern parts of the Northern Territory and Kimberley inland. Batchelor is likely to reach 37 degrees. If it exceeds this threshold it would be the hottest day since January. These very warm conditions are not confined to the far north, as they are also spreading to western WA due to a dominant heat trough expanding from the NT across to WA. Overnight, Halls Creek Airport dropped to 22.5 degrees, the highest since May and 3.5 degrees above the September average. In central-western parts of Western Australia, Meekatharra could increase to mid 30s. If it exceeds 34 degrees, it would be the hottest since April. This warm airmass will shift to southeastern parts of Western Australia and parts of South Australia as hot northerly winds ahead of the cold front drag the warmth south. The next warm period is looking to be on Monday or Tuesday after a cold front will bring cool air from the south to prevent hot temperatures this weekend.