BMKG Forecasts 3.0-Metre Waves off Southern Bali

Denpasar — The Meteorology, Climatology, and Geophysical Agency (BMKG) forecast clear to partly cloudy conditions across Bali on Tuesday, Oct. 20, 2026, with temperatures of 19–34 degrees Celsius and no district or city-level rain warning from 8 a.m. WITA through 8 a.m. on Wednesday, Oct. 21.

The forecast also put waves as high as 3.0 metres in the waters south of Bali. BMKG said the conditions could pose risks to ferry operations when winds reach 21 knots and waves reach 2.5 metres; fishing boats face risks at 15 knots and waves of 1.25 metres.

Why it matters for Bali travellers and residents

For foreign visitors and residents, the forecast means that a sunny day on land does not necessarily indicate calm conditions at sea. Ferry passengers and people using smaller fishing or passenger boats may encounter more difficult sailing conditions in southern Bali waters, depending on wind and wave conditions at the time of departure.

The forecast covered all of Bali and reported wind from the east to southeast at 6–36 kilometres per hour. A separate report from IDN Times, citing the Denpasar regional BMKG office, gave southern Bali wave conditions of 1.0–2.0 metres and listed conditions at several ports, including Nusa Penida, where waves were reported at 1.25–2.5 metres. Those figures describe the conditions reported for specific waters and ports, while the Bali Post report identified a potential maximum of 3.0 metres in southern Bali waters.

BMKG is Indonesia’s national weather and geophysics agency. Its marine warnings are relevant to ferries, fishing boats and other vessels because safety risks depend on the combination of wind speed and wave height, rather than on rainfall alone.

Sources

• Bali Post — regional news report
• IDN Times — regional news report
• tribunnews.com
• momsmoney.kontan.co.id