The Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) forecasts light rain across most parts of Indonesia on Saturday, January 3, 2026. Forecaster Alya Sausan shared island-specific details via the agency's YouTube channel from Jakarta, warning of potential thunderstorms in some areas and heavy rain in North and South Kalimantan.
BMKG forecaster Alya Sausan provided the national outlook via the agency's YouTube channel.
Sumatra: cloudy in Banda Aceh and Tanjung Pinang; light rain in Medan, Pekanbaru, Padang, Jambi, Bengkulu, Palembang, and Bandar Lampung; moderate rain possible in Pangkalpinang.
Java: thick clouds in Serang; light rain in Jakarta, Semarang, and Yogyakarta; moderate rain in Bandung. "Beware of rain that may be accompanied by thunder in the Surabaya area," Alya said.
Kalimantan: thick clouds in Pontianak; light rain in Palangkaraya and Samarinda; moderate rain in Banjarmasin.
Bali and Nusa Tenggara: cloudy in Denpasar and Mataram; thick clouds in Kupang.
Sulawesi: light rain in Makassar, Kendari, Gorontalo, and Manado; moderate rain in Mamuju. "Beware of thunder rain that may occur in Palu," she added.
Maluku: light rain in Ternate and Ambon.
Papua: light rain in Sorong, Manokwari, Jayapura, and Nabire; moderate rain in Jayawijaya and Merauke.
BMKG reminds the public to stay alert for heavy to very heavy rain in North Kalimantan and South Kalimantan, helping people prepare for potential extreme weather.
