Tuesday, 1 October 2024 - Monthly Climate Summary for Western Australia - Product code IDCKGC11R0

Western Australia in September 2024

Rainfall

• September rainfall was above average to very much above average in the north, in contrast to below average rainfall in the south-western parts of the state.
• The area-averaged September rainfall was 20.2 mm for WA, which was 97.1% above the 1961–1990 average, and the seventh-highest for September on record.
• The area-averaged September rainfall was 17.7 mm for the South West Land Division (SWLD), which was 53% below the 1961–1990 average, and the driest September since 2019.
• It was unseasonally wet in the north, and many locations in the Kimberley, eastern Pilbara and Northern Interior districts had their wettest September on record, or wettest September for at least 20 years.
• Over the long weekend of 21-24 September, the northern WA recorded unseasonable rain, with widespread daily rainfall totals of 20-60 mm, and up to 80 mm in isolated spots in inland Kimberley on the 23rd. Many locations recorded their highest September daily rainfall on record.
• Yulmbu broke its previous September daily rainfall record (29.2 mm on 13 September 1975) two days in a row (64.6 mm on the 22nd, 78.8 mm on the 23rd), and the latter had exceeded the previous record September rainfall total for this station (71.4 mm in September 1975).

Temperature

• Mean maximum temperatures were above average in the west, the far north and south of the state.
• The area-averaged September mean maximum temperature for WA was 1.87 °C above the 1961–1990 average, and the tenth-highest for September on record.
• A number of sites near the west coast including Kalbarri and Perth Airport had their warmest September (days) on record.
• Broome Airport recorded a mean maximum temperature of 34.5 °C, which was 2.6 °C above its September average, and the second-highest for September on record. The record is 34.6 °C in September 2015.
• Broome Airport recorded 12 days in total with maximum temperatures at least 35.0 °C, which was twice its September average (6 days).
• It was unusually cool in the Kimberley on the 17th, with maximum temperatures capped at mid-20s, and a number of sites had their coolest September day on record.
• Mean minimum temperatures were above average for most of the state except in the far south where mean minimum temperatures were near average to below average.
• Frosty nights were recorded in the southern locations generally in the second half of September. Wandering in the Great Southern recorded 10 days in total with minimum temperatures at or below 2.0 °C, which was 2 days more than its September average (7.9 days).
• The area-averaged September mean minimum temperature for WA was 2.34 °C above the 1961–1990 average, and the highest on record for September.
• Several stations on the Kimberley and Pilbara coast recorded their warmest September (nights) on record.
• Nights at Broome Airport were mild to very warm; minimum temperatures for the whole month had never dropped below its September's average (18.5 °C), and the minimum temperature of 27.4 °C on the 30th was its highest minimum temperature in September on record. Broome Airport's mean minimum temperature at 23.3 °C was more than 2 °C above its previous record.

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top

Maps
	Observed	Anomaly	Decile rank
Total rainfall
Mean daily maximum temperatures
Mean daily minimum temperatures

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* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported

Extremes Maps Records Summaries Important notes the top

Extremes Maps Records Summaries Important notes the top