The Agency for Meteorology, Climatology, and Geophysics, known as BMKG, has announced that nearly all of Jakarta still holds the potential for rain today, Monday, May 11, 2026. This precipitation is expected to be of light intensity across the entire mainland Jakarta area. In contrast, the Thousand Islands region is predicted to experience only cloudy skies throughout the day.
A similar weather prediction has been issued by BMKG for areas surrounding Jakarta. Today’s rain is likely to be light across all these regions, with the exception of Bekasi Regency. Other areas, including Bogor City, Bekasi City, Tangerang City, Depok City, South Tangerang City, and Tangerang Regency, all share a potential for light rainfall.
Previously, in its statement titled ‘Indonesia Rain Potential Period May 8–14, 2026’, BMKG indicated a strengthening of the Australian Monsoon. This trend typically leads to a decrease in rain potential, however, the agency urged continued vigilance in some parts of Indonesia. Specific areas, including Banten and West Java, were advised to remain alert for an increase in moderate to heavy rainfall during the period of May 11-14.
The underlying cause for this heightened rainfall potential, despite the strengthening Monsoon, remains consistent: the activity of the Madden-Julian Oscillation (MJO). Identified through spatial filtering, the MJO is projected to traverse significant portions of Sumatra, Kalimantan, Java, Bali, Nusa Tenggara, Sulawesi, Maluku, and Papua, influencing weather patterns across these regions.
Furthermore, eastward-propagating Kelvin Waves are also predicted to be active along the eastern coast of Sumatra, the Riau Islands, Bangka Belitung, Lampung, Kalimantan, Java, Bali, Nusa Tenggara, Sulawesi, Maluku, North Maluku, and Papua. These atmospheric phenomena contribute significantly to localized weather developments.
Adding to these dynamics, Equatorial Rossby Waves are also forecast to be active in parts of East Nusa Tenggara (NTT), southern Sulawesi, Maluku, and the western coast of Papua. The combined presence of these atmospheric disturbances is highly likely to boost the formation of rain clouds in the affected territories, underscoring the complex interplay of climatic factors influencing Indonesia’s weather.
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Summary
The BMKG has forecasted light rain for most areas of Jakarta and its surrounding regions on May 11, 2026, with the exception of the Thousand Islands, which is expected to remain cloudy. While the strengthening Australian Monsoon typically reduces rainfall, the agency advises continued vigilance as several regions in Banten and West Java remain at risk for moderate to heavy precipitation.
This weather activity is driven by the Madden-Julian Oscillation, combined with the presence of Kelvin and Equatorial Rossby Waves across various parts of Indonesia. These atmospheric phenomena are actively contributing to the formation of rain clouds across much of the archipelago. Consequently, authorities emphasize that these complex climatic factors will continue to influence regional weather patterns throughout the week.