NSW Experiences Severe Weather, Sydney Records Historic Rainfall
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Severe weather conditions have eased across much of New South Wales (NSW), Australia, following a period of intense rainfall and damaging winds. while the immediate threat has diminished, strong wind warnings remain in place for coastal areas, and communities are continuing too assess the impacts of flooding. Sydney experienced one of its wettest Septembers on record, with significant rainfall totals prompting emergency responses and disruptions.
Recent Weather Events & Warnings
The Bureau of Meteorology (BoM) cancelled severe weather warnings for the Mid North Coast, Hunter, and Northern Tablelands Forecast Districts on September 12, 2025. https://www.bom.gov.au/nsw/warnings/ Though, a strong wind warning remains active for Sydney Enclosed waters, Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast, Illawarra Coast, Batemans Coast, and Eden Coast. Coastal areas should remain vigilant for hazardous surf conditions.
The recent weather system brought three consecutive days of heavy rainfall to the central NSW coast, leading to localized flooding in Sydney and Wollongong. Rainfall totals were particularly high, with Newport recording 122mm and Cronulla experiencing 147mm in the 24 hours leading up to 9am on September 12th.
Historic Rainfall in Sydney
Sydney recorded 122mm of rain in the 24 hours to 9am on September 12, 2025, marking the heaviest daily rainfall total for September since 1879. https://www.weatherzone.com.au/ This significant rainfall contributed to September 2025 being one of Sydney’s wettest on record. The BoM is continuing to analyze rainfall data to determine the exact ranking of this September compared to historical records.
Emergency Response & Impacts
The State Emergency Service (SES) responded to over 850 calls for assistance in the 24 hours preceding September 12th, primarily related to the heavy rainfall.https://www.ses.nsw.gov.au/ A surge in calls was received from across Sydney on Wednesday, September 11th, from residents stranded in their homes or trapped in vehicles on flooded roads.
A group of hikers required rescue at Wattamolla, south of Sydney, due to the impact of the heavy rainfall. Authorities are urging residents to avoid unneeded travel and to never drive through floodwaters.
Understanding Severe Weather in NSW
NSW is prone to severe weather events, particularly during the spring and summer months. These events are often linked to a combination of factors, including:
* East Coast Lows: Intense low-pressure systems that form off the east coast of Australia, bringing heavy rainfall and strong winds.
* La Niña: A climate pattern in the Pacific Ocean that can increase rainfall across eastern Australia.
* Atmospheric Rivers: Concentrated bands of moisture in the atmosphere that can deliver significant rainfall.
The BoM provides detailed information on these weather systems and issues warnings to help communities prepare. https://www.bom.gov.au/
Looking Ahead
While the immediate severe weather threat has eased, NSW residents are encouraged to remain vigilant and stay informed about potential hazards. Authorities are continuing to monitor the situation and provide updates as needed. Long-term forecasts suggest a continued possibility of above-average rainfall in eastern Australia, highlighting the importance of preparedness for future weather events.