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Sydney Sizzles: City Faces Scorching October After Record-Breaking September Heat
2 Oct, 2025
Summary
- Sydney hit with second-hottest September since 1858
- City received above-average rainfall in 7 of 9 months this year
- Sudden Stratospheric Warming over Antarctica driving hot, windy conditions

According to the article, Sydney is bracing for a scorching October after the city was hit with the second-hottest September since records began in 1858. The sweltering temperatures come on the heels of the city's wettest September day in 146 years, marking a month of extreme weather conditions.
The article notes that Sydney has received above-average rainfall in seven of the nine months so far this year, with August being the hardest-hit month. However, the city has also experienced intense heat, with Weatherzone reporting an average maximum of 23.5°C in September, which is 3.3°C above the monthly average.
Experts attribute the extreme conditions to the Sudden Stratospheric Warming (SSW) over Antarctica, which is weakening the polar vortex and turning into a negative Southern Annular Mode. This pattern typically brings drier, warmer weather to the north and east of the country, while cold fronts and low-pressure systems deliver rain to the southern states.
The article also highlights that the heat is not limited to Sydney, with Brisbane bracing for a scorching end to the week, with temperatures set to climb to 35°C on Thursday, a staggering 9°C above the October average. The extreme warmth has prompted the Queensland Fire Department to extend a total fire ban across South East Queensland, as the state grapples with the threat of bushfires.