Super New Moon in June 2026: BMKG Warns of Potential Tidal Flooding

The Super New Moon phenomenon is expected to occur in June 2026. This astronomical event is drawing attention as it may affect tidal conditions in several regions of Indonesia. The Meteorology, Climatology, and Geophysics Agency (BMKG) has issued an early warning regarding the potential for tidal flooding (rob) in various coastal areas.

According to BMKG, a Super New Moon occurs when the New Moon phase coincides with the Moon being at its closest point to Earth, known as perigee. This position strengthens the Moon’s gravitational pull on Earth compared to normal conditions. BMKG’s early warning indicates that this phenomenon is expected to occur on 15 June 2026, potentially increasing maximum sea level tides in various Indonesian waters. This rise in sea levels is a primary factor that can trigger coastal or tidal flooding, particularly in low-lying areas near the coastline.

BMKG predicts that the potential for tidal flooding may persist from 8 to 25 June 2026. This prediction is based on tidal monitoring, water level data, and maritime meteorological analysis conducted by the agency. BMKG warns that these conditions should be monitored closely as they may disrupt community activities in coastal areas, including port operations, coastal settlements, aquaculture, and maritime transport.

Potential affected areas include the coasts of Aceh, North Sumatra, West Sumatra, Riau Islands, Lampung, Banten, DKI Jakarta, West Java, Central Java, East Java, Bali, West Nusa Tenggara, East Nusa Tenggara, West Kalimantan, Central Kalimantan, South Kalimantan, North Kalimantan, North Sulawesi, Maluku, and South Papua. BMKG noted that the timing of tidal flooding will vary by region based on local tidal characteristics.

BMKG advises residents and those working in coastal areas to increase vigilance during the period of potential tidal flooding. The public is also encouraged to continuously monitor maritime weather information, sea tides, and early warnings issued through official BMKG channels. Early anticipatory measures can help reduce the risk of activity disruptions and losses caused by seawater inundation.