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Built 2026-10-19 (19 October 2026)

Heat wave in Australia, 11 to 23 September 2023

Heat wave in Australia, 11 to 23 September 2023: 588 records at 187 stations, peak on 18 September 2023. Closed.

Data as of . Last revised (2026-10-17).

Key Facts

  • Heat wave in Australia, 11 to 23 September 2023 set or tied 588 station records at 187 stations.
  • It ran from 11 September 2023 to 23 September 2023 (13 days) and its peak day was 18 September 2023.
  • Status: closed.
  • Montague Island Lighthouse set a monthly record high minimum temperature of 22.1 C (71.8 F) on 20 September 2023.
  • The busiest day was 18 September 2023 with 109 records.
  • The oldest broken record in the ranked list had stood for 132 years.

Footprint

11 to 23 September 2023
Footprint of Heat wave in Australia, 11 to 23 September 2023 The area covered by Heat wave in Australia, 11 to 23 September 2023 is outlined, with 16 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in Australia, 11 to 23 September 2023 is outlined, with 16 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in Australia, 11 to 23 September 2023: stations that set records in the event
StationTypeValueDate
Montague Island LighthouseRecord high minimum temperature22.1 C (71.8 F)2023-09-20
Robe ComparisonRecord high minimum temperature14.1 C (57.4 F)2023-09-13
Richmond RaafRecord high maximum temperature33.8 C (92.8 F)2023-09-16
Archerfield AirportRecord high maximum temperature34.9 C (94.8 F)2023-09-21
Adelaide West TerraceRecord high maximum temperature30.8 C (87.4 F)2023-09-17
MallacootaRecord high maximum temperature34.7 C (94.5 F)2023-09-19
KyancuttaRecord high maximum temperature33.7 C (92.7 F)2023-09-14
Gabo Island LighthouseRecord high minimum temperature18.7 C (65.7 F)2023-09-20
Essendon AirportRecord high maximum temperature24.5 C (76.1 F)2023-09-15
Ulladulla AWSRecord high minimum temperature22.1 C (71.8 F)2023-09-20
Canberra ForestryRecord high maximum temperature25.4 C (77.7 F)2023-09-14
Narooma RvcpRecord high maximum temperature34.2 C (93.6 F)2023-09-19
Ceduna AMORecord high maximum temperature39.8 C (103.6 F)2023-09-17
Parramatta North (Masons DriveRecord high minimum temperature22.5 C (72.5 F)2023-09-20
Bankstown Airport AWSRecord high maximum temperature35.4 C (95.7 F)2023-09-18
Cabramurra SmheaRecord high minimum temperature12.5 C (54.5 F)2023-09-19

Records per Day

Peak day 109
Records per day during Heat wave in Australia, 11 to 23 September 2023 Records set or tied each day from 11 September 2023 to 23 September 2023. The most in one day was 109 on 18 September 2023. 0 30 60 90 120 09-1109-1309-1509-1709-1909-2109-23
Records set or tied each day from 11 September 2023 to 23 September 2023. The most in one day was 109 on 18 September 2023.
Records per day during Heat wave in Australia, 11 to 23 September 2023
DateRecords
2023-09-111
2023-09-123
2023-09-1325
2023-09-1467
2023-09-1546
2023-09-1657
2023-09-1769
2023-09-18109
2023-09-19100
2023-09-2077
2023-09-2131
2023-09-222
2023-09-231

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Australia, 11 to 23 September 2023 ranked by margin
Mallacoota, 09-199.0 C (16.2 F)
Richmond Raaf, 09-165.5 C (9.9 F)
Gabo Island Lighthouse, 09-185.2 C (9.4 F)
Bankstown Airport AWS, 09-184.7 C (8.5 F)
Montague Island Lighthouse, 09-203.4 C (6.1 F)
Ulladulla AWS, 09-203.4 C (6.1 F)
Montague Island Lighthouse, 09-172.5 C (4.5 F)
Adelaide West Terrace, 09-172.4 C (4.3 F)
Archerfield Airport, 09-212.3 C (4.1 F)
Canberra Forestry, 09-142.2 C (4.0 F)
Parramatta North (Masons Drive, 09-202.2 C (4.0 F)
Gabo Island Lighthouse, 09-201.9 C (3.4 F)
Essendon Airport, 09-151.4 C (2.5 F)
Cabramurra Smhea, 09-190.6 C (1.1 F)
Robe Comparison, 09-130.5 C (0.9 F)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

Margin against age of the broken record in Heat wave in Australia, 11 to 23 September 2023 500 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right. 0 38 75 113 150 0.02.55.07.510.0 Margin (C) Years the old record stood
500 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.
Margin against age of the broken record in Heat wave in Australia, 11 to 23 September 2023
Margin (C)Years the old record stood
3.451
0.5132
5.560
2.380
2.472
9.026
0.188
1.935
3.427
1.474
0.357
2.265
0.368
0.142
2.227
0.142
2.544
5.216
4.741
0.642
3.541
2.640
4.826
3.341
0.932
0.142
1.435
0.758
0.168
4.628
3.542
4.226
0.142
2.421
5.514
0.465
0.256
3.141
3.541
1.021
4.026
1.648
4.828
3.641
1.624
6.924
1.641
1.656
4.726
2.241
5.013
4.122
2.941
3.341
0.322
4.314
4.516
5.126
1.248
2.641
2.441
2.841
2.926
5.226
3.926
4.916
4.926
1.541
6.84
4.20
1.929
1.348
4.028
4.622
5.124
2.041
2.341
4.916
5.016
3.216
0.521
3.15
4.326
4.426
3.416
2.041
2.041
0.852
3.926
1.214
5.116
3.126
2.130
4.722
1.841
2.041
2.220
3.814
3.526
3.326
4.916
2.141
3.026
1.641
1.741
3.722
1.841
1.941
3.326
4.014
3.416
1.341
0.250
3.128
2.041
1.541
3.820
2.326
0.821
4.228
2.826
5.20
4.78
1.641
1.641
2.45
4.516
1.341
4.816
0.841
2.08
3.226
0.314
0.636
0.241
1.041
2.526
1.241
0.220
0.941
2.926
3.716
3.225
1.85
1.78
1.136
2.022
0.142
0.341
3.716
2.622
2.026
2.922
1.526
1.141
2.126
2.326
2.414
0.55
2.926
0.741
0.210
0.741
0.95
1.620
0.140
2.326
2.016
0.926
1.136
1.028
2.120
0.236
1.713
0.142
1.426
2.422
0.626
1.826
2.026
3.222
0.141
3.314
3.413
2.512
3.016
1.926
5.08
0.75
0.141
0.114
2.816
3.416
2.08
2.54
0.737
0.422
1.128
2.528
1.526

Compared With Other Events

Station records per event
Station records in Heat wave in Australia, 11 to 23 September 2023 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 20249,869 records
Heat wave in United States, 28 January to 24 February 20266,528 records
Heat wave in United States and Mexico, 24 May to 19 June 20205,047 records
Heat wave in United States and Mexico, 26 March to 17 April 20213,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 20223,626 records
Heat wave in Australia, 11 to 23 September 2023 (this event)588 records

Every Record Set

20 of 588
Every record set or tied during Heat wave in Australia, 11 to 23 September 2023, in date order
DateStationRecordValueMarginYears stoodSignificance
2023-09-13Robe ComparisonRecord high minimum temperature14.1 C (57.4 F)0.5 C (0.9 F)13242 of 100 (Notable)
2023-09-14KyancuttaRecord high maximum temperature33.7 C (92.7 F)0.1 C (0.2 F)8835 of 100 (Notable)
2023-09-14Canberra ForestryRecord high maximum temperature25.4 C (77.7 F)2.2 C (4.0 F)6532 of 100 (Routine)
2023-09-14Adelaide West TerraceRecord high minimum temperature17.2 C (63.0 F)0.3 C (0.5 F)6831 of 100 (Routine)
2023-09-15Essendon AirportRecord high maximum temperature24.5 C (76.1 F)1.4 C (2.5 F)7434 of 100 (Routine)
2023-09-16Richmond RaafRecord high maximum temperature33.8 C (92.8 F)5.5 C (9.9 F)6040 of 100 (Notable)
2023-09-17Adelaide West TerraceRecord high maximum temperature30.8 C (87.4 F)2.4 C (4.3 F)7237 of 100 (Notable)
2023-09-17Ceduna AMORecord high maximum temperature39.8 C (103.6 F)0.1 C (0.2 F)4230 of 100 (Routine)
2023-09-17Montague Island LighthouseRecord high minimum temperature16.8 C (62.2 F)2.5 C (4.5 F)4430 of 100 (Routine)
2023-09-18Richmond RaafRecord high maximum temperature36.0 C (96.8 F)0.1 C (0.2 F)4230 of 100 (Routine)
2023-09-18Gabo Island LighthouseRecord high maximum temperature28.7 C (83.7 F)5.2 C (9.4 F)1630 of 100 (Routine)
2023-09-18Bankstown Airport AWSRecord high maximum temperature35.4 C (95.7 F)4.7 C (8.5 F)4129 of 100 (Routine)
2023-09-19MallacootaRecord high maximum temperature34.7 C (94.5 F)9.0 C (16.2 F)2637 of 100 (Notable)
2023-09-19Narooma RvcpRecord high maximum temperature34.2 C (93.6 F)0.3 C (0.5 F)5732 of 100 (Routine)
2023-09-19Cabramurra SmheaRecord high minimum temperature12.5 C (54.5 F)0.6 C (1.1 F)4229 of 100 (Routine)
2023-09-20Montague Island LighthouseRecord high minimum temperature22.1 C (71.8 F)3.4 C (6.1 F)5147 of 100 (Notable)
2023-09-20Gabo Island LighthouseRecord high minimum temperature18.7 C (65.7 F)1.9 C (3.4 F)3535 of 100 (Notable)
2023-09-20Ulladulla AWSRecord high minimum temperature22.1 C (71.8 F)3.4 C (6.1 F)2734 of 100 (Routine)
2023-09-20Parramatta North (Masons DriveRecord high minimum temperature22.5 C (72.5 F)2.2 C (4.0 F)2730 of 100 (Routine)
2023-09-21Archerfield AirportRecord high maximum temperature34.9 C (94.8 F)2.3 C (4.1 F)8039 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 588 records the event counts. The counts above use the full total.

Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.