Read the full report September to November rainfall is likely to be above average across parts of northern Australia. For most of the country, the chances of a wetter or drier three months are roughly equal. September is likely to be wetter in localised areas over northwest WA, southern NSW and southern Tasmania, but drier in parts of southern WA. The current outlook reflects a weakening negative Indian Ocean Dipole and tropical Pacific Ocean temperatures that may briefly approach La Nina thresholds. Historical outlook accuracy for September to November is moderate to high over most of Australia.
Current weekly chart of the Southern Oscillation Index (SOI)
Information sourced from Weatherzone
The Southern Oscillation Index, or SOI, gives an indication of the development and intensity of El Niño or La Niña events in the Pacific Ocean.
El Niño is typically associated with lower than average rainfall, while La Niña is associated with above average rainfall.
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