MetService says a combination of high temperatures and strong winds in parts of the South Island on Sunday will increase the risk of fire.
The season is already dry.
Southland and Otago are expected to reach temperatures from the low to high 30's as well as northwest gales of 120km per hour.
Forecaster Oliver Druce says it's a "dangerous cocktail" in terms of fire risk.
Several places in the North Island will also reach temperatures in the 30's, including Wairarapa and Hawke's Bay.
