How Bali rainfall is measured: stations, totals and extreme events
Bali rainfall is not one island-wide number: BMKG records station observations, monthly totals, rainy days and extremes, while BPS supplies the province-wide statistical context.
By Mukmin John
Editor: Mursyid Sonsang
· 2 min read
Bali’s rainfall is measured through observation stations and reported as both rainfall totals and rainy days, rather than as one island-wide figure. BMKG’s 2025 annual climate bulletin records station observations, monthly rainfall maps and extreme events, while BPS provides the wider statistical context for Bali.
How is Bali’s rainfall measured?
BMKG’s Bali climatology station compiles rainfall data from manual and automatic observations and standardised analysis and forecasts, according to BMKG, 2026. Its annual 2025 bulletin presents monthly rainfall, the number of rainy days, monthly maximum rainfall and maps for Bali.
Why are there different rainfall figures across Bali?
Rainfall varies by location, so BMKG reports ranges and station or area-specific peaks rather than treating the province as one uniform weather zone. In September 2025, monthly rainfall across Bali ranged from 0.0 to 806.5 millimetres, with the highest total recorded at 806.5 millimetres and 16 rainy days, according to BMKG, 2025.
What counted as an extreme rainfall event in 2025?
BMKG’s annual record identifies daily rainfall above 50 millimetres as an extreme event in its 2025 station observations. The listed events included 60.0 millimetres on 26 January, 121.4 millimetres on 10 May and 385.5 millimetres on 10 September, according to BMKG, 2026.
What does a rainy-day figure mean?
A rainy day is counted separately from the rainfall total. BMKG recorded months with more than 20 rainy days at its Bali climatology station in January 2025, when 25 rainy days were recorded; March, May and November each recorded 20 rainy days, according to BMKG, 2026.
How does this fit with Bali’s wider official data?
BPS publishes Bali’s provincial statistical yearbook, covering demographic, social, economic and geographic indicators, according to BPS, 2025. BMKG’s rainfall series therefore supplies the climate measurement, while BPS provides the broader statistical framework used to describe conditions across the province.
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