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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Southern Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
If you’re in Sydney’s coastal suburbs or the Illawarra, expect persistent rain and gusty southerly winds as a coastal low deepens offshore. The live forecast above gives the immediate outlook; this system is likely to bring hazardous surf and localised flooding to low-lying areas.
How does a coastal low affect greater Sydney?
Coastal lows form along the New South Wales coast when a trough interacts with moist easterly airflow. For Sydney, this typically means steady rain spreading from the south, strongest along the coast and in the eastern suburbs. The winds shift southerly, often reaching gale force near the cliffs of Bondi and Coogee. Neighbouring catchments such as Botany Bay and the Parramatta River may rise quickly, especially if the low stalls.
Will this system become an east coast low?
Coastal lows can intensify into east coast lows if they gain a more organised circulation. That transition brings stronger winds, heavier rain and a higher risk of flash flooding. Check the Sydney weather page for updates and the latest severe weather warnings from authorities.
Should I prepare for flooding in low-lying areas?
Yes, especially along the Cooks River, Georges River and Narrabeen Lagoon. If the coastal low stalls, 24-hour totals above 100 mm can cause minor to moderate flooding. Have an emergency kit ready and check flood warnings.
How long do these coastal lows typically last?
Most clear within 24 to 36 hours as a high-pressure ridge moves in from the west. However, some systems may linger for two to three days if the steering flow weakens, prolonging wet and windy conditions.
Why does the wind feel colder during a coastal low?
The persistent southerly flow draws cool, moist air off the Tasman Sea. Combined with cloud cover and steady rain, temperatures often stay 5 to 8 degrees below the seasonal average, making it feel raw even in autumn.