TEMPO.CO, Jakarta - The Meteorology, Climatology, and Geophysics Agency (BMKG) has placed several areas on alert for heavy to very heavy rain during the period of January 16-22, 2026. These regions include West Java and East Java, which also face warnings for strong winds during this timeframe.
BMKG reported that Indonesian weather has recently shown a significant rise in rainfall intensity. The agency specifically noted Central Java, where daily rainfall reached 188.4 mm, a level classified as extreme (exceeding 150 mm).
Higher rainfall occurred along the northern coast of Greater Jakarta (Jabodetabek) from Monday morning to Tuesday morning, January 12-13. Data from the Tanjung Priok and Sunter Rawabadak Maritime Meteorology Stations showed 235 mm and 203 mm, respectively. Several monitoring posts in the region also recorded heavy to extreme rainfall.
Floods inundate the Sedyatmo Toll Road area, Tangerang City, Banten, January 12, 2026. Antara/Putra M. Akbar
According to BMKG, this extreme weather results from combined regional factors, including cyclonic circulation and a strengthening Asian monsoon. The circulation, located south of West Nusa Tenggara, has developed into Tropical Cyclone Seed 96S.
These factors created and intensified a convergence zone across southern Indonesia, particularly Java, Bali, and West Nusa Tenggara. "So it plays a crucial role in triggering the growth of intensive rain clouds in those areas," according to BMKG.
In the coming week, BMKG forecasts that global, regional, and local atmospheric dynamics will continue to impact Indonesia's weather. Beyond the Asian monsoon and 96S seed, factors include a weak La Niña, Madden-Julian Oscillation (MJO) activity, Equatorial Rossby Waves, and the Nokaen Tropical Cyclone in the Philippine Sea.
BMKG Early Weather Warning List: January 16-18, 2026
Caution (Heavy to very heavy rain): South Sumatra, Bengkulu, Banten, Jakarta, West Java, Central Java, Yogyakarta, East Java, West Nusa Tenggara, and Maluku.
Strong Winds: Bangka Belitung Islands, South Sumatra, Lampung, Bengkulu, Banten, Jakarta, West Java, Central Java, Yogyakarta, East Java, West Kalimantan, Central Kalimantan, South Kalimantan, Bali, West Nusa Tenggara, East Nusa Tenggara, South Sulawesi, Southeast Sulawesi, North Sulawesi, Maluku, North Maluku, South Papua, Central Sulawesi, Gorontalo, West Papua, and Central Papua.
BMKG Early Weather Warning List: January 19-22, 2026
Caution (Heavy to very heavy rain): West Java, East Java, East Nusa Tenggara, South Sulawesi.
Strong Winds: South Sumatra, Bangka Belitung Islands, Lampung, Banten, Jakarta, West Java, Central Java, Yogyakarta, East Java, Bali, West Nusa Tenggara, East Nusa Tenggara, Central Kalimantan, South Kalimantan, West Kalimantan, South Sulawesi, Central Sulawesi, North Sulawesi, Southeast Sulawesi, North Maluku, Maluku, West Papua, Southwest Papua, Highland Papua, South Papua, and Papua.
Read: BMKG Warns of Severe Weather in Greater Jakarta Today
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