Sydney's weather is likely to take a wild turn on Tuesday night, with heavy rainfall and strong gusts possible along coastal regions from the Victorian border northwards.

The Bureau of Meteorology has issued a severe weather warning for the south and Illawarra coasts for damaging winds, with gale force winds forecast to reach more than 90 km/h. Wind speeds are already reaching 82 km/h on Gabo Island on Tuesday afternoon.

Pack a strong umbrella for Wednesday. Credit:Ben Rushton

For Sydney, the "feels like" temperatures dropped to as low as 8.3 degrees in the late morning on Tuesday as winds shifted around to the south.

Those winds will likely strengthen and bring with them more showers by the evening. The bureau is predicting a few millimetres of rain for the remainder of Tuesday, and has lifted the forecast to 40-60 millimetres for Wednesday.