It follows two large scrub fires at Christchurch's Port Hills and at Pumpkin Hill in the Coromandel Peninsula this weekend.
Both fires are now under control, but wildfire specialist Graeme Still, said conditions are very dry at the moment, with hot weather expected in many parts of the country over the next few days.
And despite the green pastures, the soil underneath is full of dead and dry material which can fuel fires, he warned.
"It's sort of called a green drought and those fuels are readily available to burn, especially when we've had some reasonably strong winds and that's what's predominately pushing our fires at the moment."
Still said getting long range forecasts would help people in these areas immensely.
The National Institute of Water and Atmospheric Research (NIWA) is expecting the next seven to 10 days to produce hot and dry conditions for much of the country.
Principal scientist and forecaster Chris Brandolino said the soil was drier than normal in Northland, Coromandel, Auckland, Tasman, Canterbury, Otago and eastern Southland.
However, he said it was unlikely that this week's dry period would be a permanent feature of the summer.
Brandolino said above normal or near normal rainfall was expected for the upper South Island the North Island, but for the rest of the country, rainfall could fall below normal levels.
