A male is in a stable condition this morning after falling into a bonfire south of Auckland.

He was taken to Middlemore Hospital's National Burns Centre in a serious condition last night.

It's not known how old he is.

In another fireworks incident, a 20-year-old man is in Southland Hospital with a serious facial injury.

A rocket hit him directly in the eye in the early hours of this morning and he was rushed to hospital from Waikaka north of Gore where he is awaiting a transfer to another hospital today.

Fire service northern communications shift manager Scott Osmond said firefighters were called to about a dozen fireworks-related incidents overnight but the Pukekohe incident was the only major event.

Southern fire communications shift manager Brent Dunn said he couldn't yet put a figure on the number of callouts his area had responded to, but said it was a busy night.

"There were quite a few fireworks calls, which we'd expect."

Selwyn, North Canterbury and Dunedin were the busiest areas for callouts, he said.

In the bottom half of the North Island, about half a dozen callouts were fireworks-related, fire's central communications shift manager said.