Overnight minimum temperatures will be a consistent 16 degrees through to Sunday with maximums reaching 26 degrees on Friday and 27 degrees for Saturday and Sunday.

Port Macquarie lifeguard supervisor James Turnham says all swimmers should be wary of potential flash rips at all beaches this weekend.

He said the onshore winds and swell had combined to see a number of the rips forming over the last few days.

"They (flash rips) are prevalent so lifeguards and surf life savers encourage people to swim to their ability," he said.

"I would recommend swimming to waist deep only and keep your feet on the ground.

"This is particularly important with many state cup players in town and looking to cool off later in the day.

"Patrols finish at 5pm at most beaches and when the flags come down those beaches are not patrolled."

Mr Turnham said while the swell does not appear to be big the conditions are "fairly rippy".

Lighthouse Beach will be the most protected beach.

Meteorologist with weatherzone Joel Pippard says Port Macquarie's renowned sea breezes will keep a lid on temperatures rising any further.

"We currently have a high pressure system over the Tasman Sea and that is directing easterly sea breezes onto the coast," he said.

"A very hot low pressure trough is also sitting over Western Australia and South Australia which will bring a warmer air mass eastward.

"However, when that air mass arrives, those sea breezes will keep it from getting too hot."

Mr Pippard said minimum temperatures could rise fractionally as more humidity becomes dominant.

Monday's maximum temperature is expected to reach about 29 degrees.

On the water on Friday, we can expect northeasterly winds reaching 20 knots in the afternoon and evening with a swell of 1 to 1.5 metres increasing to 1 to 2 metres inshore.

On Saturday, there will be a southeasterly swell around 1 metre inshore increasing to 1.5 metres offshore. A second swell will be easterly to about 1 metre increasing to 1 to 1.5 metres.

By Sunday, the winds will be northeasterly 15 to 25 knots. Seas will be 1 to 2 metres.

The first swell is likely to be southeasterly around 1 metre, increasing to 1 to 1.5 metres and a second swell will be easterly at 1 to 1.5 metres.

Mr Pippard said the swell would provide some great swimming conditions at a number of Port Macquarie's beaches.

"Looking ahead, there is the chance of some rain from about Tuesday as a southerly change starts to make its way up the coast. There might be some showers or possible thunderstorms," he said.

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