Monday's maximum temperature is likely to climb to 31 degrees which is about seven degrees above the long term average for this time of the year.

Meteorologist with weatherzone, Kim Westcott, says the higher than average temperatures are due to a low pressure trough.

"That trough has warm winds in front of it and these will dominate the temperatures through Monday and into Tuesday," she said.

"But there is a cold front behind this trough and that is likely to be evident by Tuesday.

"This trough will see a southerly change likely to move into the Mid-North Coast, causing a dramatic drop in temperatures.

"Monday will be pretty beautiful really in terms of temperature.

"It is really a bit of everything," Ms Westcott said. "All of NSW will be cooling down."

Ms Westcott says the warm weather could flow into Tuesday but there will be a bit of a race to see just when those cold winds actually arrive.

"It could be as high as 32 degrees (on Tuesday) but it really does depend on when that cold change gets here," she said.

"We do know that the cold winds will bring some fast-moving showers with 1-5 millimetres of rain predicted."

Those showers won't hang around, she added.

Maximum temperatures for Wednesday, Thursday and Friday will be much cooler, possibly dropping to 23 degrees.

There is also likely to be a few showers on each of these days.

In regards to temperatures, Monday will be the warmest night with 18 degrees before falling to around 13 and 14 degrees for the remainder of the week.

Looking further ahead, Saturday should be fine with the chance of showers on Sunday.

Out to sea, there is a strong wind warning for the Macquarie Coast on Tuesday with 1-2m wave height.

The southerly change will see winds increase to 20 to 30 knots before dropping later in the week.

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