INDOPOSCO.ID – The Meteorology, Climatology, and Geophysics Agency (BMKG) has forecast that most major cities across Indonesia are likely to experience light to moderate rainfall on Friday (January 9, 2026).
According to BMKG’s weather early warning system, in Sumatra, major cities expected to see light to moderate rain include Aceh, Medan, Pekanbaru, Tanjung Pinang, Padang, and Palembang.
“Jambi, Bengkulu, Pekanbaru, Pangkal Pinang, and Bandar Lampung are forecast to experience heavy rain accompanied by thunderstorms,” BMKG forecaster Ina Indah said in a broadcast monitored from Jakarta.
Light to moderate rain is also expected in Jakarta, Bandung, Semarang, Yogyakarta, and Banten. Meanwhile, Surabaya is forecast to be hit by heavy rain accompanied by lightning.
On Kalimantan Island, Pontianak, Palangka Raya, and Samarinda are expected to see light to moderate rainfall. Tanjung Selor and Banjarmasin are forecast to experience heavy rain with lightning.
“Meanwhile, Bali and Mataram are expected to see light rain, while Kupang is forecast to experience heavy rain accompanied by lightning,” she said.
In Sulawesi, light to moderate rain is likely to occur in Mamuju, Makassar, Kendari, Palu, and Gorontalo. Meanwhile, Manado is expected to be cloudy.
Moving to the easternmost regions, cities such as Ternate, Sorong, Nabire, Jayapura, Jayawijaya, and Merauke are forecast to experience light to moderate rainfall. Manokwari and Ambon are expected to be cloudy.
In addition, BMKG has issued an early warning for the potential of high waves reaching up to six meters in several Indonesian waters, including the North Natuna Sea.
BMKG Director of Maritime Meteorology Eko Prasetyo, speaking in Jakarta on Wednesday, said the high wave potential is expected to occur during the period of January 7–10, 2026.
The BMKG Meteorology Team confirmed that the conditions are influenced by the presence of Tropical Cyclone Jenna in the southwestern Indian Ocean and Tropical Cyclone Seed 90W in the Philippine Sea, which have triggered increased wind speeds and wave heights in Indonesian waters.
BMKG noted that wind patterns in northern Indonesia generally move from the northwest to northeast at speeds of 6–25 knots, while in the southern regions winds generally move from the southwest to northwest at similar speeds.
Head of BMKG Teuku Faisal Fathani emphasized that reliable, integrated, and sustainable information management from upstream to downstream is a key pillar in hydrometeorological disaster risk management.
Strong information is considered a crucial foundation in supporting early warning systems, mitigation efforts, and effective disaster-related decision-making. (aro)
