Aucklanders are being told to rug up warm for a chilly night without power.
Over 100,000 households and businesses have had their power cut off following Tuesday night's storm.
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Lines company Vector limited says power has been restored to around 90,000 customers, but there are still many more without power.
It's warning some may be forced to wait several days for supply to be returned as crews try to prioritise different areas.
As well as power Auckland will have to manage cold temperatures as Autumn officially makes itself known.
Civil Defence is warning the sun is due to set at 6:28pm and the temperature is expected to dip to 7degC.
"Make sure you're ready to rug up in some jumpers/blankets or grab some firewood if available plus ensure you have torches and batteries handy," a spokesperson said.
Those without power are advised to conserve hot water and avoid opening any fridges or freezers and letting the cold air out.
Once the power returns residents should throw out any frozen food that has been exposed to temperatures of more than 4DegC for two hours or has an unusual odour, colour or texture.
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Residents should contact their doctor if they're concerned about medication that may have spoilt.
Civil Defence recommends using this time to restock the emergency kit too and make sure you have plenty of fresh batteries, canned foods and other supplies.