Thursday 1 October 2026 - Monthly Climate Summary for Remote Islands and Antarctica - Product code IDCKGC1RR0
Remote Islands and Antarctica in September 2026
Jump to a map of the areas covered in this summary
Australia's Indian Ocean islands
- The monthly rainfall total at Christmas Island Aero was 2.6 mm, this was well below the September average rainfall of 53.8 mm.
- At Christmas Island Aero, the mean maximum temperature was 0.8 °C above average and the station had its warmest September mean maximum temperature since 1983.
- The mean minimum temperature at Christmas Island Aero was 0.6 °C above average.
- The monthly rainfall total at Cocos Island Airport was 21.0 mm, this was below the September average rainfall at 90.60 mm.
- It was the warmest September at Cocos Island since 1999 at 27.6 °C.
- At Cocos Island Airport, the mean maximum temperature was 1.8 °C above average and the warmest mean maximum temperature on record for September at 30.1 °C. The station also had its highest September daily maximum temperature on record on the 3rd at 31.6 °C.
- The mean minimum temperature at Cocos Island Airport was 1.1 °C above average.
Australia's Pacific Ocean islands
- Monthly rainfall at Norfolk Island Aero was 32.0 mm, this was below the average September rainfall of 92.2 mm and the lowest September rainfall total since 2020.
- At Norfolk Island Aero, the mean maximum temperature was 0.3 °C above average, in contrast the mean minimum temperature was 0.1 °C below average.
- The monthly rainfall total at Lord Howe Island Aero was 62.6 mm, this was below the average September rainfall of 110.8 mm.
- At Lord Howe Island Aero, the mean maximum temperature was 0.4 °C above average and the mean minimum temperature was 0.7 °C above average.
Australia's Antarctic and sub-Antarctic territories
- The strongest wind gust recorded at the Australian Antarctic stations during September was 178 km/h at Casey on the morning of the 17th.
- Mean maximum and mean minimum temperatures for September were above average at Casey, but below average at Davis and Mawson.
- Observations from Macquarie Island temporarily ceased on September 13th.
Extremes Records Summaries Daily observations Important notes the top
| Record highest September temperature | ||||||
|---|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for September |
|||
| Cocos Island Airport | 31.6 | on the 3rd | 30.9 | on 23 Sep 2024 | 75 | 28.3 |
| Record highest September mean maximum temperature | |||||
|---|---|---|---|---|---|
| New record (°C) |
Old record |
Years of record |
Average for September |
||
| Cocos Island Airport | 30.1 | 29.5 | in 1999 | 75 | 28.3 |
| Highest September mean maximum temperature for at least 20 years | |||||
|---|---|---|---|---|---|
| Observed (°C) |
Most recent higher |
Average for September |
|||
| Christmas Island Aero | 27.1 | 27.6 | in 1983 | 26.3 | |
note: there may be gaps in the historical record at some sites, so it is possible more recent higher values have gone unreported
| Highest September mean temperature for at least 20 years | |||||
|---|---|---|---|---|---|
| Observed (°C) |
Most recent higher |
Average for September |
|||
| Cocos Island Airport | 27.6 | 27.7 | in 1999 | 26.1 | |
note: there may be gaps in the historical record at some sites, so it is possible more recent higher values have gone unreported
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 |
|||
| Offshore Islands | ||||||||||||
| Lord Howe Island Aero | 20.5 | +0.4 | 23.1 | 21st | 15.4 | +0.7 | 10.7 | 17th | 62.6 | 110.8 | low | 56% |
| Norfolk Island Aero | 19.4 | +0.3 | 21.3 | 5th | 13.7 | -0.1 | 11.5 | 9th | 32.0 | 92.2 | v low | 35% |
| Christmas Island Aero | 27.1 | +0.8 | 28.2 | 22nd | 22.9 | +0.6 | 21.0 | 28th | 2.6 | 53.8 | low | 5% |
| Cocos Island Airport | 30.1 | +1.8 | 31.6 | 3rd | 25.1 | +1.1 | 22.4 | 8th | 21.0 | 90.6 | low | 23% |
| Antarctica and Macquarie Island | ||||||||||||
| Casey | -8.9 | +1.0 | -3.5 | 2nd | -16.3 | +1.1 | -24.0 | 21st | 4.6 | 18.9 | v low | 24% |
| Davis | -13.5 | -0.9 | -7.4 | 24th | -20.6 | -1.0 | -26.1 | 15th | 5.4 | 5.3 | average | 102% |
| Macquarie Island | ||||||||||||
| Mawson | -14.9 | -0.9 | -9.0 | 24th | -22.2 | -1.9 | -27.6 | 15th | ||||
Extremes Records Summaries Daily observations Important notes the top
| Daily maximum temperatures for September 2026 | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 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 |
| Lord Howe Island Aero | 21.4 | 21.3 | 21.5 | 21.7 | 22.7 | 22.7 | 21.2 | 19.0 | 18.2 | 18.5 | 19.2 | 19.2 | 19.4 | 20.6 | 21.8 | 18.8 | 18.0 | 19.4 | 20.8 | 22.2 | 23.1 | 21.5 | 19.7 | 20.4 | 20.4 | 22.1 | 22.7 | 18.8 | 19.5 | 20.6 |
| Norfolk Island Aero | 19.6 | 18.5 | 19.6 | 20.6 | 21.3 | 21.1 | 20.8 | 18.3 | 18.7 | 19.7 | 17.8 | 18.8 | 18.7 | 18.7 | 18.2 | 18.6 | 18.3 | 18.0 | 19.9 | 20.9 | 20.7 | 20.5 | 18.6 | 18.8 | 18.5 | 18.8 | 19.8 | 21.1 | 18.9 | 19.6 |
| Christmas Island Aero | 27.2 | 27.1 | 27.1 | 27.0 | 26.8 | 27.0 | 26.7 | 26.6 | 26.2 | 26.5 | 26.5 | 27.0 | 26.6 | 26.6 | 26.7 | 27.4 | 27.2 | 26.9 | 26.8 | 26.8 | 27.5 | 28.2 | 27.6 | 27.1 | 27.4 | 28.0 | 27.5 | 27.8 | 28.1 | 28.1 |
| Cocos Island Airport | 30.1 | 31.1 | 31.6 | 30.8 | 28.9 | 28.1 | 28.5 | 28.5 | 29.0 | 28.5 | 29.3 | 31.0 | 30.8 | 31.3 | 30.0 | 31.4 | 31.3 | 29.7 | 29.7 | 29.7 | 29.8 | 29.6 | 29.1 | 29.6 | 31.5 | 31.3 | 31.2 | 30.6 | 29.6 | 30.5 | Antarctica and Macquarie Island | 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 |
| Casey | -6.7 | -3.5 | -6.1 | -5.7 | -5.9 | -8.4 | -5.8 | -8.8 | -6.2 | -15.8 | -15.5 | -4.0 | -9.3 | -13.6 | -14.8 | -9.2 | -5.0 | -8.7 | -15.3 | -16.1 | -8.2 | -9.1 | -10.7 | -5.3 | -5.0 | -4.2 | -7.2 | -11.2 | -12.6 | |
| Davis | -15.4 | -18.9 | -12.9 | -11.1 | -11.3 | -10.2 | -11.1 | -13.5 | -15.6 | -15.6 | -15.0 | -14.6 | -17.6 | -20.8 | -21.0 | -13.1 | -15.4 | -19.4 | -13.6 | -10.6 | -10.6 | -9.3 | -10.2 | -7.4 | -8.9 | -10.3 | -17.3 | -11.5 | -10.1 | -11.8 |
| Macquarie Island | 5.7 | 5.9 | 6.5 | 5.6 | 3.5 | 4.8 | 5.7 | 5.7 | 4.6 | 5.2 | 4.0 | 5.7 | 6.4 | |||||||||||||||||
| Mawson | -21.6 | -16.1 | -15.1 | -14.9 | -16.2 | -19.1 | -17.2 | -15.9 | -18.3 | -15.2 | -13.8 | -15.4 | -19.0 | -18.5 | -16.7 | -14.2 | -16.0 | -19.5 | -18.8 | -12.5 | -12.0 | -10.9 | -12.5 | -9.0 | -10.4 | -11.2 | -14.0 | -11.5 | -10.5 | -11.0 |
|
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 | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 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 |
| Lord Howe Island Aero | 14.2 | 12.9 | 18.0 | 19.4 | 18.3 | 19.6 | 18.0 | 13.1 | 14.6 | 14.6 | 14.6 | 15.6 | 13.9 | 15.1 | 15.6 | 15.6 | 10.7 | 12.8 | 15.4 | 17.4 | 13.9 | 17.0 | 16.3 | 16.5 | 15.2 | 16.5 | 17.1 | 14.2 | 13.7 | 13.5 |
| Norfolk Island Aero | 14.5 | 13.3 | 12.4 | 13.2 | 14.8 | 14.4 | 15.5 | 13.1 | 11.5 | 14.6 | 13.5 | 13.7 | 13.8 | 13.8 | 11.8 | 11.7 | 13.5 | 12.7 | 14.0 | 16.2 | 14.9 | 13.4 | 16.8 | 13.6 | 14.2 | 12.0 | 14.0 | 13.7 | 13.4 | 12.2 |
| Christmas Island Aero | 23.3 | 23.2 | 23.2 | 22.9 | 23.1 | 22.8 | 21.4 | 22.1 | 21.9 | 21.6 | 22.1 | 23.3 | 23.5 | 23.5 | 23.3 | 23.3 | 22.9 | 22.9 | 23.2 | 23.4 | 23.4 | 23.1 | 22.9 | 23.5 | 23.6 | 23.2 | 23.0 | 21.0 | 22.6 | 23.3 |
| Cocos Island Airport | 25.5 | 25.5 | 25.8 | 25.4 | 25.9 | 23.3 | 23.6 | 22.4 | 25.0 | 24.8 | 25.0 | 24.8 | 25.6 | 25.9 | 25.7 | 25.9 | 25.8 | 25.6 | 25.1 | 24.9 | 25.9 | 24.6 | 24.2 | 25.4 | 24.1 | 25.5 | 25.8 | 25.7 | 25.3 | 25.7 | Antarctica and Macquarie Island | 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 |
| Casey | -20.0 | -18.5 | -12.5 | -11.5 | -9.9 | -9.2 | -13.3 | -16.4 | -17.2 | -20.5 | -22.2 | -19.5 | -10.7 | -16.9 | -19.5 | -19.3 | -20.4 | -10.2 | -17.7 | -24.0 | -21.6 | -21.4 | -13.9 | -14.0 | -11.0 | -16.2 | -9.2 | -12.0 | -16.2 | |
| Davis | -23.9 | -22.3 | -21.4 | -20.0 | -15.7 | -17.2 | -16.4 | -17.7 | -23.2 | -24.6 | -22.5 | -21.1 | -23.6 | -25.4 | -26.1 | -25.9 | -23.7 | -24.9 | -25.0 | -23.9 | -18.0 | -13.4 | -16.6 | -21.1 | -17.7 | -13.2 | -21.0 | -21.0 | -18.1 | -14.0 |
| Macquarie Island | -0.8 | 0.9 | 4.7 | 2.8 | 0.8 | 0.7 | 1.5 | 1.5 | 0.9 | 0.5 | -0.4 | -0.3 | 1.4 | |||||||||||||||||
| Mawson | -26.6 | -27.3 | -25.6 | -18.8 | -20.7 | -24.9 | -24.2 | -21.1 | -22.7 | -22.3 | -20.9 | -16.7 | -23.3 | -25.4 | -27.6 | -27.2 | -23.8 | -25.3 | -27.2 | -26.1 | -19.3 | -17.1 | -18.5 | -18.4 | -15.6 | -18.6 | -20.8 | -22.3 | -21.1 | -16.7 |
|
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 | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Offshore Islands | 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 | |
| Lord Howe Island (Milky Way) | - | - | - | - | - | 1.8 | - | 7.2 | 2.0 | 4.0 | - | - | - | 0.4 | - | 11.2 | 9.4 | 1.0 | - | - | - | - | - | - | 0.8 | - | - | 7.0 | 0.6 | 2.2 | |
| Lord Howe Island Aero | - | - | - | - | - | 0.6 | 0.6 | 6.4 | 1.6 | 2.8 | 0.8 | - | - | 0.4 | - | 5.8 | 17.0 | 0.8 | - | - | - | - | - | - | 1.4 | 0.2 | - | 20.0 | 0.6 | 3.6 | |
| Norfolk Island Aero | 0.2 | - | - | 0.2 | - | - | 5.2 | 3.6 | 1.2 | 0.4 | 0.2 | 0.6 | 0.2 | 0.4 | - | 1.0 | 9.0 | 5.8 | 0.4 | - | - | - | - | - | 0.2 | - | - | 3.4 | - | ||
| Christmas Island Aero | - | - | - | - | - | - | 2.0 | - | - | 0.2 | 0.2 | - | - | - | - | - | - | - | - | 0.2 | - | - | - | - | - | - | - | - | - | - | |
| Cocos Island Airport | - | - | - | - | - | 4.0 | 0.2 | 1.0 | - | - | - | - | - | - | - | 0.8 | - | - | - | - | - | 1.0 | 9.6 | 4.2 | 0.2 | - | - | - | - | Antarctica and Macquarie Island | 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 |
| Casey | 1.0 | - | - | - | - | - | - | - | - | - | - | - | - | - | 0.2 | 2.0 | - | - | - | - | - | 0.6 | 0.8 | ||||||||
| Davis | 0.1 | - | - | - | 0.1 | - | - | - | 0.6 | - | - | - | - | - | - | - | 0.3 | - | - | - | 0.8 | 1.3 | - | - | 2.0 | - | - | - | 0.2 | - | |
| Macquarie Island | 1.8 | 10.0 | 5.2 | 1.8 | 2.8 | 0.2 | 3.0 | 3.8 | 4.6 | 5.6 | 10.6 | 6.0 | 3.6 | 2.8 | |||||||||||||||||
|
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 Remote Islands and Antarctica using the most timely and accurate information available on the date of publication; it will generally not be updated.
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.
Unless otherwise noted, all maps, graphs and diagrams in this page are licensed under the Creative Commons Attribution 4.0 International Licence
