A broad cloudband of tropical origins is stretching across much of NSW, bringing chilly daytime temperatures.

The satellite imagery below shows a broad area of cloud extending across much of NSW on Tuesday. The temperature observation overlaid shows the mercury struggling to exceed the low-teens, with alpine and tableland areas struggling to reach the double digits.

Image: Visible satellite imagery and temperature observations at 1pm on Tuesday, July 15, 2025.

This cloud mass comes from moisture that has slowly crept east across the continent after having been drawn south from the Indian Ocean over the weekend.

Image: Water vapour satellite imagery showing moisture streaming from the Indian Ocean across Australia on Monday, July 14, 2025.

As this moisture moved over the Australian continent, it formed into a broad band of thick cloud. This cloudband has thickened enough to significantly reduce the incoming solar radiation coming into NSW, leading to the chilly day.

Sydney has slowly crept up to the mid-teens this afternoon under the persistent cloud cover, but should start cooling down into the evening now. With a maximum of 14.6°C reached, this makes it Sydney’s coldest July day in 3 years.

Image: Hourly temperature and cloud cover (Pro) forecast for Sydney on Tuesday, July 15, 2025 on the Weatherzone app.

Elsewhere across the state, broad swaths of western, central and northern NSW have been limited to the low-teens. As of 3pm on Tuesday, these western NSW locations are currently experiencing their coldest day in:

• 9 years at Wilcannia Ap with a running maximum of 10.4°C
• 5 years at Ivanhoe Ap with a running maximum of 9.5°C
• 4 years at White Cliffs with a running maximum of 11.5°C

Image: Maximum temperature across NSW on Tuesday, July 15, 2025.

The cloudband will dissipate and move off the NSW coast late tonight, allowing the temperature to drop into a chilly start to Wednesday. Moisture left from inland rain across western and central NSW, combined with the cold early morning temperatures will lead to areas of fog tomorrow morning as well.

Image: Forecast minimum temperatures across NSW on Wednesday, July 16, 2025.