Cowper said Fire and Emergency NZ had "good reason" to put a fire ban in place and did not take the decision lately.
Assessment of dry conditions and the Fire Weather Indices proved that it would be dangerous to light up anywhere at the moment, he said.
Bay of Plenty fire crews had bolstered their response to small fires and were sending three crews to every fire as they could get out of control quickly with current conditions, he said.
"People really need to be aware".
He said people should not get a false sense of security after the brief rain on the weekend as it had "done very little" for fire conditions.
"We need at least 150mm to 200mm of consistent rain."
Fire and Emergency NZ would inform people when they were able to light up again.