Is late September–October a good time to see rough ocean conditions in New Zealand, or would March be better?

Hi everyone,

I’m planning to visit New Zealand sometime between late September and the end of October. One thing I really enjoy when traveling is dramatic coastlines and watching the ocean when it’s rough — big waves, strong winds, and standing on cliffs looking at the sea.

Would that time of year be good for that, or would March be a better time to experience stronger ocean conditions?

Also, if there are specific coastal spots where this is especially impressive, I’d love to hear your recommendations.