El Niño 2026–27 in Bosnia and Herzegovina
Odds favour a wetter-than-normal December–February in Bosnia and Herzegovina (51% chance). Past El Niño years show no consistent rainfall pattern here.
Temperatures: likely warmer than the 1993–2016 average (88% 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: likely wetter
Temperature: likely warmer
February–April
Rainfall: likely wetter
Temperature: likely warmer
Away from the tropics, seasonal rainfall forecasts have limited skill. Treat small shifts in the odds as weak signals. “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: Banja Luka, 15 November 2026: Moderate (PM2.5 12.7 µg/m³, AQI 58).
| City | 11/15 | 11/16 | 11/17 | 11/18 |
|---|---|---|---|---|
| Sarajevo (capital) | 31Good | 19Good | 29Good | 9Good |
| Banja Luka | 58Moderate | 42Good | 22Good | 11Good |
| Zenica | 49Good | 27Good | 29Good | 9Good |
| Mostar | 21Good | 16Good | 21Good | 24Good |
| Tuzla | 55Moderate | 57Moderate | 49Good | 11Good |
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) | No consistent pattern (+0.7 °C on average) |
| Jan–Mar | No consistent pattern (about 1% more rain on average) | No consistent pattern (−0.3 °C on average) |
| Feb–Apr | Drier in 7 of 10 El Niño seasons (about 10% less rain on average) | Warmer in 7 of 10 El Niño seasons (+0.5 °C on average) |
| Mar–May | No consistent pattern (about 4% less rain on average) | No consistent pattern (−0.1 °C on average) |
| Apr–Jun | No consistent pattern (about 2% less rain on average) | No consistent pattern (−0.3 °C on average) |
| May–Jul | No consistent pattern (about 7% more rain on average) | No consistent pattern (−0.1 °C on average) |
| Jun–Aug | No consistent pattern (about 4% more rain on average) | No consistent pattern (+0.1 °C on average) |
| Jul–Sep | Drier in 7 of 9 El Niño seasons (about 4% less rain on average) | No consistent pattern (+0.4 °C on average) |
| Aug–Oct | No consistent pattern (about 4% less rain on average) | No consistent pattern (+0.2 °C on average) |
| Sep–Nov | No consistent pattern (about 13% less rain on average) | Warmer in 12 of 15 El Niño seasons (+0.9 °C on average) |
| Oct–Dec | No consistent pattern (about 9% less rain on average) | Warmer in 11 of 15 El Niño seasons (+0.8 °C on average) |
| Nov–Jan | No consistent pattern (about 7% less rain on average) | Warmer in 11 of 15 El Niño seasons (+0.8 °C on average) |
Source: ERA5 monthly reanalysis (Copernicus Climate Change Service); El Niño seasons from NOAA's Oceanic Niño Index. Method.
Official warnings
Federal Hydrometeorological Institute (FHMZ BiH)
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 drier
- Follow water-use notices from your local water utility, and fix leaks early.
- Farmers: check planting advice and drought bulletins from the national agriculture and weather services before the season.
- Clear dry vegetation near homes where wildfires are possible, and know your local fire-danger rating.
- Keep a few days of drinking water stored if supply cuts have happened in past dry years.
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.
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
Albania · Andorra · Croatia · Greece · Italy · Kosovo · Malta · Montenegro · North Macedonia · Portugal · San Marino · Serbia · Slovenia · Spain
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 Bosnia and Herzegovina”, El Niño Atlas, https://elninoatlas.pages.dev/country/bosnia-and-herz/, updated 15 November 2026.
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