Perth is forecast to have its warmest week this late in autumn for more than 30 years. A strong and near-stationary high pressure system will be centred to the south of Australia for at least the next seven days. As air flows around the centre of high pressure systems in an anticlockwise direction in the southern hemisphere, this will result in a persistent flow of warm east to northeasterly winds for Perth. The city is forecast to reach tops of 24 to 27 degrees every day this week, which is two to five degrees above average for this time of year. Perth hasn't experienced a weeklong run of days reaching 24 degrees or higher this far into the first half of a year since 1985. This comes after Perth registered its warmest day this late in autumn on record during the weekend, reaching 32.7 degrees on Saturday. The warm inland air will also be dry, with no rain is forecast for the city during the next week. This continues a notably dry autumn to date in the nation's southwest. As of 9am on Monday, Perth had only received 29mm of rain so far during autumn. This is about 151mm below the season's long-term average, and the lowest running total to this point in autumn for seven years.