El Niño 2026–27 in Indonesia
The forecast leans towards a wetter-than-normal December–February in Indonesia (43% chance). Past El Niño years show no consistent rainfall pattern here.
Temperatures: likely warmer than the 1993–2016 average (100% chance).
El Niño status: El Niño Advisory (NOAA, 12 November 2026). Outlook: Copernicus, issued November 2026.
Outlook for the next six months
December–February
Rainfall: leaning wetter
Temperature: likely warmer
February–April
Rainfall: likely wetter
Temperature: likely warmer
In the tropics, seasonal forecasts generally have useful skill during strong El Niño years, but they give odds, not certainties. “Normal” means the middle third of the model's own 1993–2016 range; because the climate has warmed since then, “warmer” is the usual result almost everywhere.
Source: Copernicus Climate Change Service seasonal forecast (Copernicus Climate Change Service (C3S) seasonal forecasts, ECMWF system 51), country average. How this is calculated.
Air quality, next 4 days
Worst forecast day: Bekasi, 15 November 2026: Unhealthy (PM2.5 110.1 µg/m³, AQI 189).
| City | 11/15 | 11/16 | 11/17 | 11/18 |
|---|---|---|---|---|
| Jakarta (capital) | 141Unhealthy for Sensitive Groups | 153Unhealthy | 159Unhealthy | 129Unhealthy for Sensitive Groups |
| Surabaya | 128Unhealthy for Sensitive Groups | 153Unhealthy | 163Unhealthy | 168Unhealthy |
| Bandung | 164Unhealthy | 168Unhealthy | 155Unhealthy | 164Unhealthy |
| Bekasi | 189Unhealthy | 176Unhealthy | 168Unhealthy | 163Unhealthy |
| Medan | 77Moderate | 98Moderate | 86Moderate | 75Moderate |
AQI = US EPA 24-hour PM2.5 scale (2024). Model forecast for an area of about 40 km, not a local measurement. Local levels can be higher or lower. Dates are UTC days.
Source: Copernicus Atmosphere Monitoring Service global forecast, run 2026-11-14 00 UTC.
What happened in past El Niños
Each row compares El Niño seasons with all other years in 1979-2025, after removing the long-term trend.
| Season | Rainfall | Temperature |
|---|---|---|
| Dec–Feb | No consistent pattern (about 1% less rain on average) | Warmer in 11 of 15 El Niño seasons (+0.2 °C on average) |
| Jan–Mar | No consistent pattern (about 2% less rain on average) | No consistent pattern (+0.3 °C on average) |
| Feb–Apr | No consistent pattern (about 0% less rain on average) | Warmer in 8 of 10 El Niño seasons (+0.4 °C on average) |
| Mar–May | No consistent pattern (about 0% more rain on average) | Warmer in 6 of 8 El Niño seasons (+0.3 °C on average) |
| Apr–Jun | No consistent pattern (about 4% less rain on average) | Warmer in 6 of 8 El Niño seasons (+0.1 °C on average) |
| May–Jul | Drier in 7 of 9 El Niño seasons (about 16% less rain on average) | No consistent pattern (+0.1 °C on average) |
| Jun–Aug | Drier in 8 of 8 El Niño seasons (about 32% less rain on average) | Warmer in 6 of 8 El Niño seasons (+0.1 °C on average) |
| Jul–Sep | Drier in 9 of 9 El Niño seasons (about 37% less rain on average) | Warmer in 8 of 9 El Niño seasons (+0.1 °C on average) |
| Aug–Oct | Drier in 12 of 12 El Niño seasons (about 35% less rain on average) | Warmer in 9 of 12 El Niño seasons (+0.1 °C on average) |
| Sep–Nov | Drier in 14 of 15 El Niño seasons (about 28% less rain on average) | Warmer in 11 of 15 El Niño seasons (+0.1 °C on average) |
| Oct–Dec | Drier in 14 of 15 El Niño seasons (about 15% less rain on average) | Warmer in 12 of 15 El Niño seasons (+0.2 °C on average) |
| Nov–Jan | Drier in 11 of 15 El Niño seasons (about 6% less rain on average) | Warmer in 12 of 15 El Niño seasons (+0.2 °C on average) |
Source: ERA5 monthly reanalysis (Copernicus Climate Change Service); El Niño seasons from NOAA's Oceanic Niño Index. Method.
Known El Niño impacts in Indonesia
El Niño typically brings less rain to Indonesia. [Climate.gov, 'Can We Blame El Niño?' (archived page, 2009)]
Fires in Southeast Asia often accompany El Niño events, and people in Indonesia tend to link El Niño with drought. [Climate.gov, 'Can We Blame El Niño?' (archived page, 2009)]
Past events
- Indonesia's 2015 fire crisis was estimated to cost US$16.1 billion, or 2% of GDP, over a five-month period. [World Bank (Glauber et al., 2016), 'The Cost of Fire', abstract via FAO AGRIS]
- An estimated 2.6 million hectares burned in Indonesia in 2015, about four times the size of Bali. [World Bank (Glauber et al., 2016), 'The Cost of Fire', abstract via FAO AGRIS]
Official warnings
BMKG (Badan Meteorologi, Klimatologi, dan Geofisika)
This is not an official forecast or warning. Seasonal outlooks give odds, not certainties. For warnings and decisions about safety, follow your national weather service.
What you can do
If it turns out wetter
- Find out whether your home, school or workplace is in a flood-risk area, and know your evacuation route.
- Clear gutters and drains before the rainy months.
- Keep important documents, medicines and a torch in a waterproof bag.
- After heavy rain, avoid walking or driving through flood water and follow local advice on drinking water and mosquito-borne disease.
If it turns out hotter
- Check on older relatives, neighbours and anyone who lives alone during hot spells.
- Drink water regularly, and avoid hard outdoor work in the hottest hours.
- Know the signs of heat exhaustion (dizziness, headache, nausea) and when to get medical help.
On smoky or hazy days
- Check the daily air-quality forecast and cut down hard outdoor exercise when it is 'Unhealthy' or worse.
- A well-fitted N95 or KN95 mask reduces smoke exposure; cloth and surgical masks do much less.
- Keep windows closed and use an air purifier with a HEPA filter if you have one.
- People with asthma, heart or lung disease, older people, children and pregnant people should take extra care.
Get a free alert when this changes
Country alerts start in December 2026. Check back here, or see the status page for the next official update dates.
Nearby countries
Brunei Darussalam · Cambodia · Lao PDR · Malaysia · Myanmar · Philippines · Singapore · Thailand · Timor-Leste · Vietnam
Sources and dates
- El Niño status: NOAA Climate Prediction Center, 12 November 2026.
- Seasonal outlook: Copernicus Climate Change Service, Copernicus Climate Change Service (C3S) seasonal forecasts, ECMWF system 51, issued November 2026.
- Air quality: Copernicus Atmosphere Monitoring Service, run 2026-11-14 00 UTC.
- Past El Niños: ERA5 (Copernicus Climate Change Service), 1979-2025; NOAA Oceanic Niño Index.
Cite this page: “El Niño 2026–27 in Indonesia”, El Niño Atlas, https://elninoatlas.pages.dev/country/indonesia/, updated 15 November 2026.
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