The developing weather system has prompted surf lifesavers and the Bureau of Meteorology to issue a warning for all beachgoers to exercise caution when entering the water over the next few days.

Swells are predicted to peak at around three to four metres in some areas but are forecast to be larger and stronger offshore.

Southern facing beaches will encounter the strongest of the conditions as the southerly swell travels up the coast.

Meteorologist with weatherzone Graeme Brittain said the Mid-North Coast coastline would receive quite gusty winds through Wednesday and Thursday.

There will also be heavy rainfall on Thursday and Friday.

NSW operations manager Andy Kent has urged the public to take the warnings seriously.

“The best advice we can give people is to be aware of their environment and the changing conditions,” he said.

“Take the time to study a recent weather forecast before heading out and let others know what your plans are.”

Mr Kent also urged all beachgoers not to take any unnecessary risks especially as volunteer surf lifesavers aren’t on patrol on weekdays.

“We strongly encourage everyone thinking about engaging in an activity on or around the coast to make that extra effort and go where lifeguards are,” he added.

Additionally a strong swell period of between 10 to 11 seconds has also been forecast with rockfishers in particular urged to be aware of the conditions when getting on and off exposed platforms.