May 2026
Southern Oscillation Index (SOI)
- The 30-day Southern Oscillation Index (SOI) for the 30 days to 06 June 2026 was -20.3.
- The latest SOI value can be found on the Bureau of Meteorology’s website.
- Sustained negative values of the SOI below −7 typically indicate El Niño while sustained positive values above +7 typically indicate La Niña.
