Thunderstorms were particularly likely in the afternoon, Law said.
“I think by the time we get to around 9pm, the worst should hopefully be cleared away from Northland.”
Law said people should keep an eye on MetService updates throughout the day.
It could be a warm night for the region as well, with the weather system bringing warmer air from the north.
The daytime high for Whangārei was looking to be about 20C, while overnight temps were unlikely to drop below 13C.
Brodie Stone covers crime and emergency for the Northern Advocate. She has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.