Archive · 24 Dec 2025
La Niña Continues, Negative IOD Ends: BoM
The Australian Bureau of Meteorology says that the La Niña weather pattern is still happening in the tropical Pacific Ocean.
This means there might be more rain and storms in some places.
At the same time, another weather pattern called the negative Indian Ocean Dipole (IOD) has ended and is now neutral.
The ocean temperatures around Australia were very warm in November, which can make storms and rain stronger.
The Bureau predicts that La Niña will continue until early 2026, and the IOD will stay neutral until at least the end of autumn 2026.
This means the weather might still be a bit extreme in some places around the world.
La Niña continues with tropical Pacific Ocean temperatures likely to remain at La Niña levels until early 2026.
Negative Indian Ocean Dipole (IOD) has ended, with the IOD index back to neutral and expected to remain so until at least the end of autumn 2026.
Sea Surface Temperatures (SSTs) in the Australian region were the second warmest on record for November, with warmer-than-average SSTs likely to persist.
Atmospheric indicators, including trade winds, pressure, and cloud patterns, show consistent signals of La Niña.
The Southern Annular Mode (SAM) index is neutral and forecast to remain so over the coming week, with a slight tendency towards negative values in the following fortnight.
- Who
- Australian Bureau of Meteorology (BoM)
- What
- La Niña continues, negative Indian Ocean Dipole (IOD) ends
- When
- As of December 2025, with predictions until early 2026
- Where
- Tropical Pacific and Australian region
- Why
- To provide updates on climate drivers and their impacts
- La Niña Index Value
- -0.91 °C (as of December 21, 2025)
- IOD Status
- Neutral (as of December 2025)
- Predicted La Niña Duration
- Until early 2026
- Sea Surface Temperatures (SSTs)
- Second warmest on record for November 2025
- Southern Oscillation Index (SOI)
- 30-day: -0.1, 60-day: +7.0, 90-day: +6.6 (as of December 21, 2025)
- Southern Annular Mode (SAM) Index
- Neutral (as of December 20, 2025)
- Predicted IOD Duration
- Neutral until at least the end of autumn 2026