Rare Blue Moon on 31 May 2026: Second Full Moon and BMKG Weather Analysis

Indonesians will have the opportunity to witness the rare Blue Moon astronomical phenomenon, peaking on Sunday, 31 May 2026. This event marks the second full moon within the month of May.

The exact astronomical full moon phase occurs during the afternoon to evening, but the best viewing is when the Moon rises in the east after sunset.

According to the latest release from the Meteorology, Climatology, and Geophysics Agency (BMKG), late May 2026 marks the transition to the peak dry season, which is good news for astronomy enthusiasts.

To maximise viewing, the public is advised to view the event free of charge without special equipment and monitor the latest weather updates via the BMKG app before outdoor observation.

The most anticipated event is the peak of the Eta Aquariid meteor shower on 5-6 May, originating from the debris of Halley’s Comet burning up in Earth’s atmosphere.