South Coast residents are being warned that extreme temperatures are on the way for the region with a heatwave forecast on Friday and Saturday.

The Bureau of Meteorology has issued a heatwave warning for residents to expect maximum temperatures in the high 20s to mid 30s with overnight minimum temperatures in the low to mid teens.

Accoring to the BOM, "temperature will increase towards the end of the week, with maximum temperatures reaching the mid 30s to low 40s and overnight minimum temperatures in the mid teens to low 20s" in some parts of the state.

Locations likely to be impacted include the Sydney metropolitan area, Newcastle, Batemans Bay, Gosford, Camden, Mona Vale, Nowra, Richmond and Wollongong.

Severe heatwave conditions are developing and will extend north along the coast in the coming days before peaking during Friday and Saturday.

Heatwave conditions are expected to ease on Sunday as a cooler change extends across the state.

Extreme heatwaves can be dangerous for everyone.

The BOM advises that severe heatwaves can be dangerous for many people, especially older people, babies, children, pregnant and breastfeeding women, people with medical conditions and people who are unwell.

Seek a place to keep cool, such as your home, a library, community centre or shopping centre.

Close your windows and draw blinds, curtains or awnings early in the day to keep the heat out of your home.

If available, use fans or air-conditioners to keep cool.

For further safety information before, during and after heatwaves, visit Ambulance NSW.

Visit ‘Beat the Heat’ for advice on staying healthy

Check the latest weather and warnings at www.bom.gov.au/nsw.

Find information on power outages at https://www.energy.nsw.gov.au/households/guides-and-helpful-advice/electricity-supply-disruptions/what-do-during-electricity