Lismore's weather will resemble Melbourne's this week. The city has a reputation for having four seasons in a day and it will feel like that for locals as we will see temperatures drop 16 degrees over two days.

The RFS has declared a Total Fire Ban for the Far North Coast today (Wednesday) as the mercury climbs to a very hot 34 degrees driven by strong northerly winds.

No fires may be lit in the open and all fire permits are suspended. Gas and electric barbecues may be used provided certain conditions are met.

Jordan Notara from the Bureau of Meteorology told the Lismore App there is a good deal of uncertainty concerning the weather over the next few days.

"Ahead of the cold front, there is the potential for some pretty isolated thunderstorms in the Northern Rivers with the potential for a severe thunderstorm warning for damaging winds and large hail."

"People should watch out for warnings in the afternoon. Conditions are uncertain."

Conditions will stay muggy for the evening as the expected southerly change won't materialise until the early hours of Thursday morning.

The relief will be felt throughout the day with The Bureau forecasting a top of 23. The south/southeasterly winds will be gusty near the coast and lighter as you head west so for Lismore the winds should be 15-25kmh.

The change brings a 70% chance of rain on Thursday with a wide range from 0-10mm, "The rain will be variable and will be persistent at times near the coast," said Jordan.

Friday will complete the 16-degree drop in maximum temperature with a top of only 18 forecast thanks to cloud cover. It is also going to be the wettest day of the week with 7 to 30mm on the radar.

"There is still a high level of uncertainty involved. We should see single digital rainfall but that could increase depending on how the system evolves," Jordan explained, "That includes how long it lingers off the coast."

The winds will increase again with the southerly reaching 25 to 35km/h in the morning and stronger along the coast.

The good news is there will be a clearing trend on Saturday morning as the trough moves into the Tasman. We could still see some rain but only up to 3mm and temperatures will start to slowly build back to the 30s by Tuesday as we return to blue skies once again.