NSW SES has urged residents not to be complacent with the rising rate of Hawkesbury River slowing.
With the forecast of more rain today and tomorrow, it says renewed rises are possible.
At present the SES is working closely with the Bureau of Meteorology and is closely monitoring the situation.
Evacuation warnings remain in place for communities in low-lying areas in North Richmond, Wilberforce, Freemans Reach and McGraths Hill.
NSW SES Incident Controller Greg Swindells praised the community for its resilience.
"We very much appreciate the patience of all the communities who have waited nervously overnight," Mr Swindells said.
"We are very closely watching the incoming weather and monitoring the situation.
"Please keep yourself up to date via the NSW SES website and Facebook page."
Mr Swindells said that SES evacuation warnings and orders were based on information such as river heights, provided by the Bureau of Meteorology for key gauges.
These are then assessed based on expected timings and the level of likely impact on the community, which determines whether an evacuation warning or order should be released.
The SES urges that residents avoid any unnecessary travel over the next few days and if you are moving around, drive to the conditions and never drive through floodwater.
Many roads around the region are closed of impassable, as well as Yarramundi, North Richmond and Windsor bridges all out of commission.
The SES says if residents are called to evacuate they should go to friends or family outside of the evacuation areas.
If that is not possible, evacuation centres have been established at: Castle Hills RSL, 77 Castle Hill Street; North Richmond Community Centre, William Street, North Richmond; and Richmond Club, East Market Street, Richmond.
For information about current evacuations can the SES Public Information and Inquiry Centre on 1800 227 228.
* NSW SES: www.ses.nsw.gov.au
* RMS Live Traffic: www.livetraffic.com
* Latest River Heights and Rainfall Observations: www.bom.gov.au/nsw/flood/greatersydney.shtml
* Latest NSW Warnings: www.bom.gov.au/nsw/warnings/
* Rainfall Forecasts: www.bom.gov.au/australia/meteye/
* BOM NSW Twitter: www.twitter.com/BOM_NSW