What will the peak RONI value be during the 2026-27 El Niño season?

Currently, the prevailing sentiment in this market suggests a 50% chance that the peak RONI value during the 2026-27 El Niño season will be at least 3.0°C. This contrasts with typical analyst forecasts, which often rely on complex climate models and historical data. While those models provide valuable insights, this market reflects a collective judgment of traders who are incentivized to accurately predict the outcome. Discrepancies between the market price and expert opinions can highlight areas of uncertainty or differing interpretations of available information regarding the El Niño event.

On Kalshi, this market is priced through a continuous double auction, meaning traders can buy and sell contracts representing different outcomes. The price of each contract reflects the probability of that outcome occurring, as determined by supply and demand. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. As more traders participate and new information becomes available, the prices will adjust accordingly, providing a dynamic assessment of the potential intensity of the 2026-27 El Niño. The current price reflects the aggregated beliefs of all participants, creating a forward-looking estimate.

This market resolves around Aug 15, 2027, with the outcome confirmed once the event is verifiable from credible public reporting. The resolution will be based on the peak RONI value observed during the 2026-27 El Niño season, as determined by a recognized and authoritative climate data source. Traders will be able to see the final result and whether their predictions were accurate. The resolution process ensures a transparent and objective determination of the market's outcome, based on widely accepted scientific measurements.

Several factors could significantly influence this market between now and its resolution. Early indicators of El Niño development, such as sea surface temperature anomalies in the Pacific Ocean, will be closely watched. Major climate reports from organizations like the NOAA and IPCC could also shift expectations. Unexpected weather patterns, particularly those affecting key regions sensitive to El Niño's influence, could also drive price movements. Finally, any significant updates to climate models or a change in scientific consensus regarding the potential intensity of the 2026-27 El Niño could impact trading activity.