What will the peak RONI be for the 2026–27 El Niño?: live odds and probabilities
The market favorite is Over 2.5 at 72.5%, ahead of 2.25–2.5 at 20.5%. $171K traded across 5 outcomes.
Favorite
24h move
Volume
Closes
WeatherclimateWeather & Science
All outcomes
| Outcome | Probability | 24h |
|---|---|---|
| Over 2.5 | 72.5% | -1.0 |
| 2.25–2.5 | 20.5% | 0.0 |
| 2.0–2.25 | 4.0% | +0.5 |
| Under 1.5 | 0.1% | 0.0 |
| 1.5–2.0 | 0.1% | 0.0 |
Prices are the Polymarket mid or last trade at 2026-11-06 03:05 UTC. A price of 64¢ implies roughly a 64% chance. Prices include spread and are not forecasts by BetG8.
Price history
Market rules and resolution
This market resolves based on the peak RONI — the single highest Relative Oceanic Niño Index (RONI) value reported by NOAA's Climate Prediction Center (CPC) across the overlapping three-month seasons ASO 2026, SON 2026, OND 2026, NDJ 2026-27, and DJF 2026-27, as published in official NOAA CPC RONI updates (https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso/roni/). See each individual market for its bracket and full resolution terms. This market may resolve immediately once NOAA has published a RONI value that determines the peak: the "Over 2.5" outcome resolves "Yes" as soon as any listed season reaches +2.5°C or above. Any other outcome will not be confirmed until NOAA publishes the DJF 2026-27 value, since RONI can still rise in a later season and DJF captures El Niño's typical peak-strength window. The first published RONI value for each listed season is final and governs resolution; no subsequent revision to a season's value will change the outcome once that season's first value has been published. If CPC's RONI dataset is permanently discontinued, other information from NOAA may be used.
This market resolves "Yes" if the peak RONI for the 2026–27 El Niño is +2.5°C or above. Otherwise, it resolves "No". This market resolves "Yes" as soon as NOAA publishes a RONI value of +2.5°C or above for any listed season. If no listed season reaches +2.5°C, this market resolves "No" once NOAA has published the RONI value for DJF 2026-27. The peak RONI is the single highest Relative Oceanic Niño Index (RONI) value reported by NOAA's Climate Prediction Center (CPC) across the overlapping three-month seasons ASO 2026, SON 2026, OND 2026, NDJ 2026-27, and DJF 2026-27, as reported in official NOAA CPC RONI updates (https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso/roni/). The first published RONI value for each listed season is final and governs resolution; no subsequent revision to a season's value will change the outcome once that season's first value has been published. If CPC's RONI dataset is permanently discontinued, other information from NOAA may be used.
How to read this market
Frequently asked questions
- Who is favored in "What will the peak RONI be for the 2026–27 El Niño?"?
- As of November 6, 2026, Over 2.5 is the favorite at 72.5%, followed by 2.25–2.5 at 20.5%.
- When does this market resolve?
- The market is scheduled to close on April 1, 2027. It resolves under Polymarket's rules once the outcome is known, which can be earlier or later than the listed date.
- How much has been traded?
- $171K in total and $3K in the last 24 hours, with about $12K of resting liquidity.
- Can I trade this market?
- Polymarket restricts access by location; the US version (Polymarket US) and the offshore site have different rules and fee schedules. Check availability in your jurisdiction. BetG8 earns a referral fee from the Polymtrade links on this page.
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Data: Polymarket Gamma and CLOB APIs, fetched by BetG8 at the time shown above. Venues may restrict access by location. 18+ only.