BMKG forecasts rain from Sept. 9 to 12 across Banten and Jakarta

Rain may fall from Sept. 9 to 12 in areas affected by the eruption of Mount Anak Krakatau, offering a possible way to reduce the impact of volcanic ash across parts of Indonesia.

BMKG chief Teuku Faisal said the agency had detected the potential for light to moderate rain, particularly in areas affected by the eruption. He made the statement during an online limited meeting on Monday about the response to the natural disaster.

Faisal also said BMKG would coordinate with Indonesia’s National Disaster Management Agency, BNPB, on aerial weather modification operations in the volcanic ash dispersion area. BMKG planned to operate from Husein Sastranegara Airport in Bandung before the airport closed because it was affected by ash.

Officials are also considering Kertajati Airport in Majalengka and Ahmad Yani Airport in Semarang. Faisal said the operation would be more effective from airports at Pondok Cabe, Halim Perdanakusuma and Kertajati because they could reach ash-affected areas in West Java, Banten and Jakarta.

The farther an airport is from the Sunda Strait, he said, the less effective the operation becomes. If the operation were carried out from Ahmad Yani Airport, rainfall would reach only eastern West Java, according to Faisal.

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We have monitored that around Sept. 9 to 12, 2026, there will be potential clouds and light to moderate rain, especially in areas affected by the Mount Anak Krakatau eruption.