Indonesia Faces Heavy Rains Despite Entering Dry Season Amid El Nino Formation

Indonesia is facing persistent heavy rainfall and thunderstorms in several regions, even as the country transitions into its dry season. This unusual weather pattern is occurring concurrently with the formation of El Nino in the Pacific Ocean and the increasing influence of the Australian monsoon.

While El Nino typically reduces rainfall in parts of Indonesia, the Australian monsoon is simultaneously introducing dry air masses. The Meteorology, Climatology, and Geophysics Agency (BMKG) has issued forecasts for heavy to very heavy rain in northern Sumatra, West Kalimantan, Central Sulawesi, West Sulawesi, and South Sulawesi from June 9-11, 2026. Similar conditions are expected in Central Sulawesi, South Sulawesi, Central Papua, and the Papua Highlands from June 12-15.

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El Nino phenomenon has led to reduced rainfall in parts of Indonesia, while the Australian Monsoon is bringing dry air masses from the continent towards Indonesia.

BMKG's analysis indicates that 28.6 percent of Indonesia has entered the dry season, particularly in the southern parts of the country, where longer periods without rain (21-30 days) have been reported. However, the agency notes that the Madden Julian Oscillation (MJO) is expected to have minimal impact on the Indonesian region in the coming week, though convective signals may persist in parts of Papua.

The conflicting weather phenomena highlight the complex climate dynamics affecting Indonesia. The persistence of heavy rains during what should be a drier period underscores the challenges in predicting and managing weather patterns influenced by global climate events like El Nino.

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Over the next week, the Madden Julian Oscillation (MJO) activity is also expected to be in phases 8 to 1 (Western Hemisphere-Africa), thus having less impact on the Indonesian region.