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The mercury will rise early

Temperatures will reach the mid 30s by lunch time with a dip in the afternoon. Possible thunderstorms out west.

PT1M6S 620 349

A cool change has brought relief to Sydney, dropping the city's temperature from 33 to 25 degrees.

The southerly cool front hit Sydney about 11.25am, after moving north from Wollongong, where the temperature dropped from 30 to 22 degrees at 10am.

The change is expected to move through to the outer western suburbs about 2pm. Those areas may also receive rain, although no rain is forecast for the CBD or eastern coast.

Warming up ... hot weather is heading to NSW.

Baking ... Sydney is set to record its highest temperature in a year. Photo: Andy Zakeli

With the change has come gusty, southerly and south easterly winds.

Weatherzone meteorologist Brett Dutschke said extensive cloud cover and northerly winds created very warm conditions in Sydney overnight, when the temperature dropped to a low of 22 degrees briefly at 3am.

Dangerous surf conditions are expected on the NSW North Coast, where waves could reach up to three metres from this afternoon.

Surf conditions at Sydney's beaches are expected to be small on Thursday, before the swell increases tomorrow and into the weekend, particularly at north-facing beaches.

Mr Dutschke said conditions were set to return to average in Sydney on Friday, when a top of 24 degrees is forecast, before a forecast top of 26 degrees on Saturday and 28 degrees on Sunday.

Sydney is expected to hit a top of 30 degrees on Christmas Eve, while Christmas Day is expected to dawn cloudy, with a maximum of 27 degrees and isolated showers forecast.

Boxing Day is forecast to be cloudy with isolated showers and a top of 24 degrees. is owned by Fairfax Media, publisher of this website.