How Bali rainfall is measured: zones, rain gauges and official figures
Bali rainfall is measured through 20 seasonal climate zones, stations and cooperating rain gauges, producing local figures for totals, rainy days and daily extremes.
By Mukmin John
Editor: Mursyid Sonsang
· 2 min read
Bali’s rainfall is not a single island-wide figure: BMKG measures it through stations and cooperating rain gauges across 20 seasonal climate zones. Monthly totals therefore vary sharply by district, while the same bulletin also records rainy days, daily extremes and whether rainfall is above or below normal.
How is Bali’s rainfall measured?
BMKG’s Bali regional office analyses observations from weather stations and cooperating rain posts across 20 Zona Musim, or seasonal climate zones. Its monthly bulletins report rainfall in millimetres, the number of rainy days and the highest one-day total for selected locations.
The method is designed to show local variation rather than produce one figure for the whole province. BPS lists Bali Province in Figures 2025 as an annual statistical publication released on 28 February 2025, providing a separate official reference for provincial data.
Why can rainfall differ so much across Bali?
Terrain and seasonal patterns mean nearby districts can record different monthly conditions. BMKG’s December 2025 bulletin recorded rainfall totals from 101–150 millimetres in parts of Jembrana and Buleleng, while some locations reached 301–400 millimetres.
The same December 2025 bulletin recorded the province’s highest monthly total as 645.0 millimetres, with 19 rainy days, in eastern Jembrana. It recorded the highest daily total as 171.0 millimetres in southern Karangasem’s Sidemen district.
What do the latest full-month figures show?
For November 2025, BMKG reported rainfall ranging from 87.0 to 671.4 millimetres across Bali. Sukasada in central and southern Buleleng recorded the monthly maximum of 671.4 millimetres and 25 rainy days, according to BMKG’s December 2025 climate bulletin.
Sidemen in southern Karangasem recorded November’s highest one-day rainfall at 123.0 millimetres. BMKG classified November’s rainfall as generally above normal in the province.
What does a rainfall number mean for residents and visitors?
A monthly total describes accumulated rain at a measurement location; it does not mean that rain fell continuously or evenly across the district. The number of rainy days and the maximum in one day add different information about how rainfall was distributed.
BMKG’s September 2025 bulletin illustrates why the daily extreme matters: Sidemen recorded 806.5 millimetres for the month over 16 rainy days, while the highest one-day total reported for Bali was 390.0 millimetres in southern Badung’s Mengwi district.
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