Severe fire danger ratings remain in place across parts of northern NSW amid sweltering spring heat.

With temperatures hitting the high 30s on Tuesday, total fire bans have been enacted in the far north coast, north coast, New England and northern slopes areas and severe ratings issued.

People living in the worst-affected areas have been warned to ensure they have a plan in place.

The RFS tweeted: “Make sure you and your family know what you will do if fire threatens. Ask yourself – when will you go, what will you take and where will you go?”

The Bureau of Meteorology said temperatures could reach 37C on Tuesday.

Despite a cooler weather forecast from midweek – with temperatures expected to drop to the mid 20s – continued dry conditions mean fire dangers will not immediately fall away, meteorologist Jonathan How said.

“With no significant rainfall, fire dangers will remain high to very high until at least the end of the week,” he said.