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A trough over the northwest brings thunderstorms. A southerly change along the NSW coast brings little if any rain but cool winds. A trough passing to the south of Tas brings some showers. High pressure keeps elsewhere mainly dry.
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Today, 3:16AM UTC
Temperature plummets after parts of Sydney hit 35°C
Temperatures in the Sydney basin have reached extremes of warmth for September, before plummeting rapidly as a dry south to southeasterly change swept across the city. Monday morning's temperatures were remarkably high not just for the time of year, but for the time of day when they occurred before the southerly air mass cooled things down significantly, with several locations in and around the city reaching or topping 35°C. Unusually hot so early in the day Some of the warmest readings in the Sydney CBD and suburbs on Monday morning or just after midday included: 35.4°C at 12:05 pm at Richmond in outer northwestern Sydney 35.0°C at 11:57 am at Penrith in outer western Sydney 33.4°C at 10:56 am at Sydney Olympic Park 32.7°C at 10:43 am at Observatory Hill, Sydney's official weather station located near the southern pylon of the Sydney Harbour Bridge It's also worth noting that the mercury reached 28.9°C at 9am at Observatory Hill, which was the city's highest 9 am reading for September in at least 17 years (Historically speaking, 9 am is an important hour of the Australian meteorological day, as it's one of two benchmark times when data was manually collected in the days before automated weather stations, which means there are many years of records for that exact time.) Big temperature drops within only a few minutes Image: Temperature and dew point observations for Sydney Airport on Monday, September 21, 2026, showing the big fluctuations as the southerly arrived mid-morning. Source: Weatherzone. As the southerly arrived, there were dramatic temperature fluctuations within a short period in Sydney and its immediate surrounds. For example: The temperature at Richmond fell more than 10 degrees in under half an hour, dropping from 35.4°C at 12:05 pm to 25.3°C at 12:30 pm. The mercury at Sydney Airport plummeted almost ten degrees in half an hour, dropping from 31.6°C to 21.9°C between 10:10 am and 10:40 am. An early-afternoon temperature drop of 11.5 degrees in just 16 minutes (from 35.5°C to 24.0°C) was recorded at Lake Macquarie-Cooranbong, in the Hunter region just north of the Central Coast. Welcome showers coming later to Sydney region Image: Two-hour satellite loop to 11 am (AEST) on Monday, September 21, 2026 for Sydney and nearby locations. Source: Weatherzone. Scattered cloud associated with the cool change could be seen pushing northwards towards Sydney on the satellite loop leading up to 11 am (AEST) on Monday morning. While no rain arrived during the morning with the first surge of the southerly, showers are expected to push in off the coast later in the day, persisting into Tuesday, as a trough forms near the coastline. Afternoon or evening thunderstorms are also possible in Sydney's west. Any rainfall from this system will be welcomed by most people within the Sydney region, as the city has been relatively dry of late, with below-average rainfall in each month since March. September has been especially dry. To 9 am this Monday, September 21, just 6.2 mm had been recorded in the city this month, with no recorded rainfall at all in some western suburbs like Penrith. While September is typically Sydney's driest month, the city still receives 68.3 mm of rainfall on average, which means rainfall is currently tracking at less than 10% of the monthly average – with only nine days remaining in the month.
20 Sep 2026, 10:05PM UTC
Extreme fire danger in NSW as snow falls in Tasmania
Southeastern Australia will experience a large temperature contrast on Monday, with snow falling in Tasmania while parts of New South Wales reach 35°C amid Extreme fire danger. A cold front crossing southeastern Australia on Monday will cause cold southwesterly winds originating from the Southern Ocean to clash with much warmer air over the Australian continent. This weather pattern is typical in spring and often causes a stark contrast of summer-like heat and wintery cold weather. On Monday, maximum temperatures will range by around 30°C between Tasmania and NSW. Cold winds and snow in Tasmania The cold front passed over Tasmania on Sunday night, delivering a burst of blustery winds and cold air. Wind gusts ahead of this front reached above 100 km/h on Sunday afternoon, including: 137 km/h at Scotts Peak Dam 128 km/h at Mount Wellington 104 km/h at Hobart Airport Image: Modelled wind gusts at 7am AEST on Monday, September 21, 2026. Source: Weatherzone. Temperatures will only reach about 5–15°C across most of Tasmania on Monday under the influence of cold southwesterly winds behind the front. However, it will feel much colder than this in some areas due to wind chill. In Hobart, the temperature at 7:10am on Monday was 7°C, but west-southwesterly winds gusting to 39 km/h made it feel more like 0.5°C in the city, due to the combined effect of cold air and wind. These icy winds are also bringing snow, with Mount Wellington receiving a dusting during Sunday night and snow forecast to reach around 400 m above sea level in the state’s west and south on Monday. Cool south to southwesterly winds will also affect Victoria and parts of NSW, SA and the ACT on Monday, although these won’t be as strong or cold as the winds buffeting Tasmania. Hot with elevated fire danger in NSW While cool air spreads over southeastern Australia on Monday, much warmer air will affect northern and parts of eastern Australia. In NSW, a stream of warm northwesterly winds will develop ahead of the approaching cold front, causing temperatures and fire danger ratings to rise in some areas. Image: Forecast maximum temperature on Monday, September 21, 2026. Source: Weatherzone. Maximum temperatures should reach around 30°C in Western Sydney and 35–36°C in parts of central and northern NSW. Cessnock, Muswellbrook and Singleton are all forecast to reach 35°C on Monday. This heat will contribute to Extreme fire danger in the Greater Hunter fire weather district, while high fire danger is also likely in other areas of northern and eastern NSW, including Sydney. Further north, Brisbane is forecast to reach 31°C on Monday, which is around 5°C above average for this time of year. Parts of western and northern Qld are tipped to reach 36 to 37°C on Monday afternoon. A cool southerly change moving up the NSW coast will reach Sydney late on Monday morning before continuing north and arriving in Brisbane on Tuesday morning.
20 Sep 2026, 2:07AM UTC
Another hot weekend day for Melbourne and Sydney
A wave of summery heat moving across southeastern Australia brought a very warm Saturday, with another hot day on Sunday for Australia’s southeastern capitals. Adelaide and Melbourne record hottest day of spring on Saturday The burst of summer sweeping across southeastern Australia brought the warmest day of spring to both Adelaide and Melbourne yesterday. Adelaide reached a maximum of 26.5°C on Saturday, making it the hottest day since last autumn. The average maximum temperature in Adelaide during September is 18.5°C, 8 degrees below yesterday’s maximum. In Melbourne, the mercury reached 26.9°C yesterday, making it the warmest September day since 2023. This was nearly 10 degrees warmer than the average September maximum temperature in Melbourne of 17.3°C. Image: Melbourne Observation History showing yesterday’s very warm day, and current conditions as of midday, as seen on the Weatherzone App. In the east, Sydney reached a maximum temperature of 31.0°C, which fell short of the 32.1°C experienced earlier this month on Saturday, September 5, as dry, blustery winds drove record heat across Sydney. Another day of heat for Melbourne and Sydney As seen in the image below, maximum temperatures across southeastern Australia are once again very warm this Sunday. Melbourne is forecast to reach 27°C, while Sydney has already reached 28.4°C just after 11am. Image: Forecast maximum temperatures across southeastern Australia on Sunday, September 20, 2026. Source: Weatherzone. A cold front has already swept into Adelaide, limiting another day of heat, and will bring an end to this spell of heat later this afternoon for Melbourne, and in the late morning tomorrow for Sydney.