Strong El Niño conditions, now near record intensity with Niño-3.4 anomalies exceeding +2.7 °C and expected to peak through late spring into summer, combined with signs of a developing positive Indian Ocean Dipole, are suppressing rainfall across southeast Australia and creating the tight market-implied odds near 25–26% for November, December, August, and October as Melbourne’s wettest month of 2026. Bureau of Meteorology outlooks indicate below-average October–December rainfall for southern Victoria, consistent with El Niño’s typical drying effect on the region during spring and early summer. Historical climatology favors November as Melbourne’s wettest month on average, while a recent heavy rainfall event exceeding 48 mm in early October has kept that month competitive, yet the broader forecast signal points to continued drier patterns that limit differentiation among the leaders.