"Check the weather, know what your skills and abilities are and what you can deal with. If those divers didn't have a boat person, that wasn't very wise of them," he said.
MetService meteorologist April Clark said offshore winds along Northland's east coast would be quite windy today and most of tomorrow, with swell as high as 4m from the northwest.
Sea condition should ease off with a change in wind to southwest late Tuesday, she said.
Intermittent showers are expected throughout Northland today as an active front moves away from the region.
Clark said there was a low risk of thunderstorms for Northland today.