Sydneysiders may need to bring a brolly to their Christmas dinner, with clouds and some rain expected across the city late on Christmas Day after a warmer weekend.

North-westerly winds will build heat in central and western Sydney throughout the week, with a scorcher in the high 30s expected on Christmas Eve.

Rain and storms could be on the radar for Sydney this Christmas Day. Credit:Jessica Hromas

But relief will arrive around the same time as Santa, with temperatures dropping early on Christmas morning.

Craig McIntosh, a meteorologist at Weatherzone, said Sydney itself will have a top of 34 degrees on Christmas eve.