BMKG: Most major cities in Western Indonesia to be hit by rain

Indonesia's Meteorology, Climatology, and Geophysics Agency (BMKG) forecasts that most major cities in western Indonesia will experience light to moderate rain on Friday, July 3, 2026. The agency attributes this weather pattern to active atmospheric dynamics and the growth of rain clouds across the western part of the archipelago.

Light rain is anticipated in Sumatra, Palangka Raya, and Samarinda. However, BMKG warns of the potential for more extreme weather, including heavy downpours accompanied by lightning, in several other urban areas of Kalimantan. Residents in Banjarmasin and Tanjung Selor should be particularly vigilant throughout the day due to the possibility of high-intensity thunderstorms.

The prevailing wet conditions in western Indonesia are strongly influenced by a cyclonic circulation currently active in the Indian Ocean west of West Sumatra. This system creates wind convergence zones along the waters west of North Sumatra and West Sumatra, as well as in the North Natuna Sea and the South China Sea. Despite the widespread rain prediction, BMKG notes that cities like Banda Aceh, Serang, Jakarta, Bandung, Semarang, and Surabaya are likely to remain partly cloudy to heavily overcast. Yogyakarta may experience haze or light fog. Meanwhile, moderate rain is expected in Nabire, with cloudy to clear skies forecast for Denpasar, Kupang, Makassar, Palu, Gorontalo, Manado, Ternate, and Merauke. BMKG advises the public to stay updated on the latest weather information through their official digital platforms and social media channels to anticipate sudden weather changes.

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Rain is expected in most areas of Sumatra, Palangka Raya, and Samarinda.