Thursday 1 October 2026 - Monthly Climate Summary for Greater Perth - Product code IDCKGC11L0

Greater Perth in September 2026

Rainfall

  • Rainfall totals for September were below average at most sites across Greater Perth.
  • September rainfall totals ranged from around 30% to around 70% of average across Greater Perth.

Temperature

Perth Metro

  • Total rainfall for Perth Metro was 38.2 mm, which is 48% of the long-term average of 79.9 mm.
  • The mean daily maximum temperature for Perth Metro was 22.1 °C, which is 1.4 °C above the long-term average of 20.7 °C.
  • The warmest day was 30.3 °C on the 16th, and the coolest day was on the 26th when the temperature reached 17.2 °C.
  • The mean daily minimum temperature for Perth Metro was 12.0 °C, which is 2.3 °C above the long-term average of 9.7 °C.
  • The coldest morning was 8.3 °C on the 1st, and the warmest morning was on the 17th when the minimum temperature was 18.2 °C.

Extremes Records Summaries Daily observations Important notes the top

Extremes in September 2026
Hottest day 31.3 °C at Millendon (Swan Valley) on the 17th
Warmest days on average 22.7 °C at Perth Airport M.O.
Coolest days on average 19.1 °C at Bickley
Coldest day 14.6 °C at Bickley on the 2nd
Coldest night 3.7 °C at Karnet on the 14th
Coolest nights on average 10.2 °C at Karnet
Warmest nights on average 14.2 °C at Rottnest Island
Warmest night 19.2 °C at Karnet on the 17th
Warmest on average overall 17.1 °C at Perth Metro
17.1 °C at Perth Airport M.O.
17.1 °C at Swanbourne
Coolest on average overall 14.7 °C at Bickley
14.7 °C at Karnet
Wettest overall 62.5 mm at Huntly
Wettest day 16.0 mm at Huntly on the 12th
16.0 mm at Mandurah on the 6th
Strongest wind gust 76.0 km/h at Rottnest Island on the 6th
76.0 km/h at Rottnest Island on the 18th
76.0 km/h at Rottnest Island on the 19th
76.0 km/h at Bickley on the 8th
76.0 km/h at Bickley on the 9th

Extremes Records Summaries Daily observations Important notes the top

Record highest September mean maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
September
Garden Island HSF 20.6 20.2 in 2023 25 19.1


Record highest September daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
September
Karnet 19.2 on the 17th 16.2 on 21 Sep 2014 61 7.4
Swanbourne 19.1 on the 17th 19.0 on 10 Sep 2015 34 11.1
Perth Metro 18.2 on the 17th =18.2 on 30 Sep 2010 33 9.7
Mandurah 18.4 on the 17th 18.2 on 28 Sep 2023 25 11.9


Record highest September mean minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
September
Perth Airport M.O. 11.5 11.1 in 2023 83 8.9
Pearce RAAF 11.2 11.0 in 2023 66 8.9
Karnet 10.2 9.7 in 2023 60 7.4
Jandakot Aero 11.1 =11.1 in 2023 37 8.4
Mandurah 13.9 13.7 in 2023 25 11.9


Record highest September mean temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
September
Perth Airport M.O. 17.2 16.9 in 2023 83 14.6
Pearce RAAF 16.8 =16.8 in 2023 66 14.6
Karnet 14.7 14.6 in 2023 60 12.5
Jandakot Aero 16.5 =16.5 in 2023 37 14.4
Garden Island HSF 17.0 16.9 in 2023 25 15.5


Extremes Records Summaries Daily observations Important notes the top

Summary statistics for September 2026
Maximum temperatures
(°C)		 Minimum temperatures
(°C)		 Rainfall
(millimetres)
Mean for
September
2026		 Diff
from
average		 Highest for
September
2026		 Mean for
September
2026		 Diff
from
average		 Lowest for
September
2026		 Total for
September
2026		 Average
for
September		 Rank of
September
2026		 Fraction of
September
average
Bickley 19.1 +1.3 27.8 16th 10.3 +1.9 7.1 9th 45.8 122.5 v low 37%
Garden Island HSF 20.5 +1.4 29.3 16th 13.5 +1.5 10.2 1st 37.6 61.6 low 61%
Jandakot Aero 21.9 +1.6 30.1 16th 11.1 +2.7 6.8 1st 42.6 83.0 low 51%
Karnet 19.2 +1.5 27.5 17th 10.2 +2.8 3.7 14th 54.4 129.0 v low 42%
Mandurah 20.8 +1.5 26.9 16th 13.9 +2.0 10.4 1st 34.6 57.1 average 61%
Millendon (Swan Valley) 22.4 31.3 17th 11.1 6.4 24th 22.8
Pearce RAAF 22.3 +2.0 31.2 17th 11.2 +2.3 6.2 2nd 21.8 67.3 v low 32%
Perth Airport M.O. 22.7 +2.3 30.9 16th 11.5 +2.6 7.1 29th 30.6 72.3 v low 42%
Perth Metro 22.1 +1.4 30.3 16th 12.0 +2.3 8.3 1st 38.2 79.9 v low 48%
Rottnest Island 19.8 +0.8 27.8 16th 14.2 +1.2 11.5 9th 32.2 51.2 low 63%
Swanbourne 21.3 +1.3 30.7 16th 12.9 +1.8 9.6 1st 36.2 76.9 low 47%

Extremes Records Summaries Daily observations Important notes the top

Daily maximum temperatures for September 2026
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Bickley 15.6 14.6 14.8 16.1 15.9 15.5 20.7 18.5 18.9 20.1 23.3 17.9 17.7 20.2 23.8 27.8 27.7 26.3 16.3 19.3 22.2 18.6 18.9 20.1 17.9 15.4 18.1 17.9 16.4 16.3
Garden Island HSF 17.4 18.1 18.6 18.5 18.7 17.5 19.6 21.1 21.8 21.5 25.0 19.9 19.9 21.8 25.2 29.3 25.7 24.9 19.3 19.5 19.0 18.9 19.9 20.1 19.6 17.1 19.3 20.5 19.2 18.2
Jandakot Aero 18.3 18.7 19.6 19.5 19.5 18.1 22.6 21.6 21.8 23.1 26.3 20.5 19.9 22.8 25.1 30.1 29.5 28.6 20.4 20.8 23.1 21.5 21.4 22.4 21.4 17.8 21.2 21.9 19.7 19.4
Karnet 15.9 15.0 15.5 15.4 16.5 15.1 20.0 18.8 19.2 21.0 17.6 19.8 21.7 27.5 27.5 25.7 16.1 21.5 21.0 17.8 19.1 22.3 17.2 18.4 18.8 16.4 16.5
Mandurah 17.2 18.0 17.5 17.9 20.6 21.2 22.2 22.1 21.8 20.4 19.9 21.9 25.7 26.9 22.8 22.8 18.9 20.5 21.3 20.3 20.9 20.1 19.1
Millendon (Swan Valley) 19.5 19.0 17.8 20.2 19.4 18.7 23.8 20.8 21.6 22.6 26.9 21.8 22.1 23.0 25.8 30.2 31.3 30.3 20.8 22.0 25.7 21.6 22.1 23.8 21.6 17.2 21.9 21.8 20.7 19.3
Pearce RAAF 19.0 18.8 18.5 20.0 18.7 19.0 22.9 20.7 21.2 22.8 26.2 20.8 21.6 23.0 26.1 30.3 31.2 29.9 20.8 20.7 25.8 21.8 22.4 23.6 21.9 17.6 22.0 21.4 20.8 19.4
Perth Airport M.O. 19.2 19.1 18.9 20.7 20.2 18.7 23.9 21.7 22.0 23.5 26.9 21.9 21.5 23.8 26.0 30.9 30.7 29.8 20.0 22.5 25.4 22.9 22.9 24.1 22.3 17.3 22.0 21.9 20.0 20.3
Perth Metro 19.2 19.2 19.2 19.5 19.8 18.1 22.9 21.7 21.9 23.5 27.4 21.2 21.0 23.1 25.5 30.3 29.5 28.9 20.3 21.4 24.4 21.1 21.5 22.8 21.1 17.2 20.8 21.7 20.5 19.1
Rottnest Island 17.1 18.3 18.9 19.0 18.6 16.9 18.3 19.0 20.5 20.9 23.3 19.8 19.9 19.9 21.5 27.8 22.8 23.4 19.0 18.7 19.2 19.1 19.6 19.9 19.2 16.6 19.8 20.9 18.8 18.3
Swanbourne 18.4 18.8 19.2 19.0 19.2 17.7 20.6 20.9 21.7 23.2 26.1 20.1 20.8 22.6 25.3 30.7 27.1 24.7 19.9 20.3 20.8 20.3 20.8 20.7 20.9 18.2 19.8 21.9 19.1 18.9
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period		 -10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period
Daily minimum temperatures for September 2026
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Bickley 7.2 8.1 10.8 10.6 10.6 10.5 9.4 10.6 7.1 8.4 8.8 12.2 9.8 9.8 10.6 12.6 17.1 12.6 11.5 11.8 10.8 10.1 9.9 9.0 10.8 8.4 10.6 10.0 8.1 10.7
Garden Island HSF 10.2 14.6 13.1 14.6 13.7 13.6 11.9 12.5 11.6 12.3 13.6 15.8 15.3 11.5 14.1 15.5 16.4 15.5 14.6 14.5 11.7 13.7 11.5 12.4 14.5 12.2 13.3 14.6 11.3 13.9
Jandakot Aero 6.8 8.6 11.3 14.0 12.4 12.2 10.5 13.0 10.7 8.4 11.4 15.3 9.1 7.4 13.8 14.7 16.9 13.2 14.8 11.4 8.3 7.7 7.9 7.7 12.2 12.0 12.1 9.7 7.4 11.1
Karnet 6.2 9.8 10.2 11.2 10.7 9.8 9.6 10.8 9.2 8.8 8.9 3.7 10.6 14.8 19.2 14.7 12.0 11.8 8.9 10.5 7.7 7.3 10.4 10.6 10.7 6.4 11.1
Mandurah 14.0 13.7 14.8 12.8 11.0 13.2 11.1 12.6 14.4 15.6 16.3 12.7 14.4 16.8 18.4 15.3 14.9 14.6 12.1 13.0 12.4 13.9 13.8
Millendon (Swan Valley) 8.7 7.3 12.8 14.0 11.9 12.7 12.1 13.2 10.0 10.8 11.6 15.4 8.9 8.7 12.1 17.1 16.9 12.4 13.6 12.0 7.8 7.4 7.2 6.4 10.4 12.3 13.2 7.2 6.7 11.6
Pearce RAAF 9.2 6.2 12.8 13.0 12.5 12.4 12.4 13.3 10.1 12.3 13.1 15.4 9.0 7.9 13.4 16.9 16.8 12.4 12.5 11.7 7.3 7.6 8.6 6.6 9.3 12.1 13.0 8.2 7.1 12.1
Perth Airport M.O. 8.0 7.1 13.2 14.1 13.2 11.8 12.3 13.3 10.1 10.4 13.2 15.3 9.7 8.7 13.9 16.1 18.2 13.4 14.2 12.6 8.5 7.9 7.6 8.0 11.0 12.4 12.9 9.9 7.1 12.1
Perth Metro 8.3 8.5 13.1 14.4 13.7 12.2 10.8 12.8 10.6 11.1 12.3 15.6 11.1 9.5 13.8 15.4 18.2 14.6 14.3 13.1 9.5 9.8 9.5 9.3 13.7 12.5 12.1 10.7 8.5 11.9
Rottnest Island 12.5 14.2 13.0 14.1 14.3 13.0 12.1 13.4 11.5 13.4 15.2 15.7 14.8 13.8 14.2 17.0 18.2 16.1 14.5 14.0 14.4 14.7 14.6 14.4 15.0 12.5 13.5 15.3 13.1 13.5
Swanbourne 9.6 12.2 12.6 14.2 14.0 11.9 10.0 12.8 10.4 12.0 13.6 15.5 15.0 11.3 14.0 16.6 19.1 14.4 14.8 13.6 11.4 11.6 11.9 11.4 13.2 11.5 12.4 11.7 10.6 13.4
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period		 -10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period
Daily rainfall for September 2026
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Anketell 0.8 - 4.0 4.2 0.2 6.4 - - - - - 1.8 - 0.5 - - - - 2.3 2.9 1.4 0.1 - - - - - - 1.0 6.2
Araluen - - 5.3 - → → 2.0 - - - - → → 4.8
Bickley 2.4 - 4.4 10.4 - 5.2 - - - - - 4.8 - - - - - - 6.0 3.2 0.4 - - - - - 0.4 1.2 7.4
Bungendore - 0.4
Chidlow 1.6 - 3.6 6.0 → → 2.6 - - - - 1.0 → 0.1 - - - - - → 1.4 - - - - - → → 5.2 6.0
Garden Island HSF 0.8 - 5.8 8.6 - 4.2 - - - - - 1.4 - 0.4 0.2 - - 0.2 1.8 1.8 - - 1.4 - - - 2.0 3.4 5.6
Gidgegannup 2.0 - 2.6 5.8 0.2 3.2 - - - - - 3.4 - - - - - - 2.6 1.2 0.4 - - 0.2 - - - 0.6 4.4 8.8
Huntly - 2.0 7.0 9.8 0.5 7.2 - - - - - 16.0 - 1.0 - - - - 14.0 4.0 - - - - - - - 1.0
Jandakot Aero 1.0 - 2.2 6.2 - 9.4 - - - - - 4.2 - - - - - - 2.2 2.2 1.0 - - - - - 0.2 1.4 12.6
Karnet 1.7 - 3.6 10.4 0.1 7.3 0.2 - - - - 8.2 - 0.2 - - - - 8.6 3.3 - - - - - - - 0.6 1.0 9.2
Karragullen North 2.6 - 4.4 9.0 - 6.4 - - - - - 6.2 - - - - - - 4.2 4.6 - - - - - - - 1.4 0.6 9.2
Maida Vale 2.8 - 3.0 6.0 - 9.2 - - - - - 3.4 - - - - - - 3.0 1.8 - - - - - - - - - 6.0
Mandurah 0.6 0.2 2.0 2.2 - 16.0 - - - - - 5.6 - 0.6 - - - - 1.2 2.0 - - - - - - - 1.4 2.8
Millendon (Swan Valley) 0.4 - 1.2 4.4 - 2.8 - - - - - 1.6 - - - - - - 2.0 1.0 - - - - - - - 0.8 8.6
Muchea 0.8 - 5.8 5.8 - 0.8 - 0.2 - - - 1.0 - - - - - - 1.4 1.4 0.4 - - - - - - - 6.8 5.8
Mundaring 3.6 - 5.2 9.2 - 3.4 - - - - - 5.6 - - - - - - 3.0 4.2 - - - - - - - - 5.0 8.2
Pearce RAAF 2.4 - 3.2 3.6 - 1.8 - - - - - 1.4 0.2 0.2 - - - - 1.4 0.6 0.2 - - - - - - 2.2 4.6
Perth Airport M.O. 1.8 - 2.0 2.6 0.2 7.2 - - - - - 2.4 - - - - - - 2.0 1.2 - - - - - - - - - 11.2
Perth Metro 2.6 - 1.6 3.0 0.2 10.0 - - - - - 1.4 0.2 - 0.2 - - - 3.0 1.2 0.6 - - - - - - 0.6 13.6
Pinjarra South 1.2 0.4 4.8 2.4 0.2 10.6 - - - - - 4.4 - - - - - - 8.8 2.6 - - - 3.0 - - - - 1.0 5.0
Roleystone 1.6 - 5.6 6.2 - 8.6 - - - - - 3.6 - - - - - - 6.4 2.6 - - - - - - - - 0.4 8.4
Rottnest Island 1.0 - 2.8 5.8 - 11.8 - - - - - 0.8 - - 0.2 - - - 1.0 1.6 0.8 - 0.2 - - - - 1.0 5.2
Serpentine 0.4 - 2.6 5.0 - - -
Swanbourne 3.8 0.2 1.8 1.6 - 12.2 - - - - - 2.4 - 1.2 - - - 0.2 1.6 1.0 0.2 - - - 0.2 - - 2.4 7.4
Tamala Park (Mindarie) - 2.6 0.2 - 8.6 7.6 - - - - - 2.4 - - - - - 1.0 2.0 0.6 0.6 - - - - - - - 2.4 -
Wanneroo 1.0 - 4.2 6.4 → → 3.4 - - - - - - - - - - - → → 6.4 - - - - - - - 3.2 3.0
Werribee 0.6 - 1.2 8.0 - 1.2 - - - - - 1.6 - - - - - - 0.8 0.8 0.4 - - - - 1.0 0.4 0.8 1.6 2.0
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount		 0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Extremes Records Summaries Daily observations Important notes the top

Notes

The Monthly climate summary, usually published in the first week of the following month, lists the main features of the weather in Greater Perth using the most timely and accurate information available on the date of publication; it will generally not be updated.

This summary includes data from observing sites in or near the Greater Perth “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to represent a socio-economic definition of each capital city. This means the greater capital city boundary includes people who regularly socialise, shop or work within the capital city, but live in the small towns and rural areas surrounding the capital city. It does not define the built up edge of the capital city.

This statement has been prepared based on information available on Thursday 1 October 2026. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases, the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, excluding the current year. The length of record can vary widely from site to site. Averages are not shown for sites with fewer than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Information about Australian Indigenous seasonal calendars is available at the Indigenous Weather Knowledge website.

Creative Commons By Attribution logo Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence

Climate