BMKG: Flood Potential Occurs In Waves During The Peak Of The Rainy Season

JAKARTA - The Meteorology, Climatology and Geophysics Agency (BMKG) reminded the potential for flooding and landslides in the 2025/2026 rainy season which can cause waves due to the peak rain in each region at different times.

Head of BMKG Dwikorita Karnawati d explained that most areas of Sumatra and Kalimantan are predicted to experience peak rain from November to December 2025.

Meanwhile, Java, Sulawesi, Maluku, and Papua will experience it from January to February 2026.

"That way the potential for hydrometeorological disasters such as floods and landslides is not simultaneous, but bumpy, following the peak period of rain in each region," he said as quoted by ANTARA, Friday, September 12.

Although the average monthly rainfall is expected to be normal, he said, extreme events still have the potential to occur.

This, according to him, is like floods accompanied by landslides that hit Bali, where the full rainfall of one month can fall in just a day with an intensity of 380 millimeters.

"What happened in Bali should be a lesson for all of us," he said.

In general, the rainy season is expected to last from August 2025 to April 2026, but most areas will experience normal rain properties, but a number of areas are expected to have the potential to receive rain above normal or wetter than usual.

"The condition of the above normal rainfall is based on the data we have, finding areas on the island of Java and shifting to areas in the west, it is appropriate to pay special attention," said Dwikorita.

That way, he continued, Ministries and Institutions (K/L) as well as local governments to the village government level are expected to be able to increase preparedness to face the peak of this long rain, including through cleaning waterways, preparing evacuation routes, and educating people in areas prone to floods and landslides.

BMKG also recommends that the agricultural sector need to adjust the planting pattern so that it does not coincide with the peak of the rainy season, while the energy sector is advised to optimize the management of reservoirs since the beginning of the season.

In addition, the health sector is reminded of the potential increase in cases of Dengue Hemorrhagic Fever (DHF) from December 2025 to January 2026 in line with high humidity of more than 80 percent.

"The most important thing is how people can be actively involved so that the impact can be minimized at least," said Dwikorita.