An unusual combination of weather is currently impacting much of New South Wales ranging from heavy rain to outbreaks of hot weather.

During Wednesday evening 27 September, minor thunderstorm activity impacted parts of Western Sydney but overall rainfall was sparse or relatively light across affected areas.

Overnight showers resulted in an increase in rainfall across parts of Sydney. However, between 4 am and 6 am Thursday morning, an isolated rain cell formed across much of Western Sydney that brought varied rainfall totals.

Heavy rain and heat 28 September 2023 to the 6 October 2023
Final rainfall across Sydney to 9 am Thursday morning 28 September 2023. Note the localised nature of the heavy falls including the 50 mm totals that fell.

On either side of this cell, rainfall totals were light. However, a small area being approximately:

  • West of Strathfield to the east and east of Blacktown to the west.
  • North of Bankstown to the south to north of Hornsby to the north.

Experienced rainfall totals ranging from 28 mm to 55 mm. This level of rainfall was not forecast and was not expected.

Rainfall totals from the event topped 55 mm at Lidcombe followed by 54 mm at North Parramatta and 50 mm at Merrylands. At Blacktown on the edge of this, 22 mm fell. At Seven Hills, 36 mm fell. At Prospect, 16 mm fell.

I have a rain gauge and recorded no more than 13.5 mm. Rainfall dropped sharply further west.

The rain cleared by sunrise with all cloud clearing by early afternoon on Thursday.

By Friday 29 September, maximum daytime temperatures across Western Sydney soared above 30C for the 7th time this month cementing September 2023 as having the most 30 degree days recorded for any September across the Western Sydney region.

Heavy rain and heat 28 September 2023 to the 6 October 2023
A remarkable image of Sydney with temperature readings taken after 3 pm Saturday afternoon. Note the 30C temperatures across Western Sydney compared to the cooler locations along the coast. From Wundermap.

In addition, it reached 30C again on Saturday 30 September 2023 across much of Western Sydney which is remarkable for the month. Maximum daytime temperatures reached:

  • Penrith - 32.8C.
  • Richmond - 31.8C.
  • Badgerys Creek - 31.1C.
  • Camden - 30.7C.
  • Horsley Park - 30.6C.





This made it 8 such days for much of Western Sydney which is a remarkable feat as this many has never been recorded during September across Western Sydney.

Heavy rain and heat 28 September 2023 to the 6 October 2023
Near sunset looking west from Doonside Saturday evening. A summer like feel is shown. Image taken using the 5200 Nikon DSLR with filter.
Heavy rain and heat 28 September 2023 to the 6 October 2023
Incredible image of the setting sun (Using a filter to capture this). The sun sinks below the western horizon.











There is currently a strong burst of heat accompanying a strong high pressure cell that has been moving across southern Australia over the past few days.

During Saturday, 30C or higher maximums featured across large swathes of New South Wales again. After 3 pm, large swathes of Western New South Wales were experiencing maximum temperatures above 35C including:

  • Bourke - 35.9C.
  • Borrona Downs - 35.6C.
  • Wilcannia - 35.4C.
  • Smithville - 35.2C.

Forecasts are being made for significant levels of heat on Sunday and Tuesday across Sydney including:


Sunday 36C and Tuesday 37C.


Sunday 37C and Tuesday 37C.

Areas outside Sydney

Wagga Wagga

Sunday to Tuesday 31C, 32C and 30C.

Lake Cargelligo

Sunday to Tuesday 35C, 37C and 36c.


Sunday to Tuesday 34C, 38C and 34C.


Sunday to Tuesday 37C, 38C and 36C.

Similar highs are being forecast across much of New South Wales during the period with highs of 37C and 38C possible in many areas on at least 1 day during the period.

Heavy rain and heat 28 September 2023 to the 6 October 2023
GFS Forecast maximum temperatures fir Eastern New South Wales for Tuesday afternoon. Note the expected heat across some areas including Sydney.

This would make this the second such event for early spring.

The heat will penetrate into the northern areas of Victoria but not expected to be as strong compared to that for New South Wales.








Strong cold front and rain system

Heavy rain and heat 28 September 2023 to the 6 October 2023
GFS Raincast for the upcoming week. Evidence exists of a significant rain event to accompany the next weather change mid week for Southern Australia.

What makes the current event unusual is what occurs on Wednesday. A strong frontal system will push through New South Wales and Victoria. This event is being watched because models are providing evidence of a significant rain event, at least for eastern Victoria and into southern New South Wales. Models are suggesting rainfalls of up to 50 mm for many areas accompanied with daytime temperatures dropping back to a more wintery 14C to 19C.

This would be significant as a strong temperature contrast would occur across the cold front traversing from east to west.

Rainfall is expected to reach the coast but with lighter totals expected.

Certainly widespread 25 to 50 mm falls are being suggested for much of Victoria and inland New South Wales with higher totals across the hilly regions and areas close to the Great Dividing Range.


It appears that this will become a rain band / rain event with maybe some embedded thunderstorms within it as it moves eastwards across the state. This will certainly end the current spell of hot early October weather.

Heavy rain and heat 28 September 2023 to the 6 October 2023
Final image of the setting sun over Western Sydney Saturday evening.

The photos attached to the post were taken on Saturday evening at Doonside looking west showing the setting sun taken using my Nikon DSLR 5200 camera with 300 mm zoom lens and a filter to permit me to catch the sunset in the form as shown.