El Niño 2026 California Forecast & Prediction Market Odds
NOAA's October 2026 update says El Niño is strengthening, with a strong to very strong event likely this winter. What that can mean for California and how weather markets work.
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18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
Quick answer
NOAA's Climate Prediction Center issued an El Niño Advisory in its 8 October 2026 update. It says El Niño continues to strengthen, with a strong to very strong El Niño likely through January to March 2027. The monthly Niño-3.4 reading was +2.1°C. NOAA adds that the chances of impacts consistent with El Niño are larger, "though not guaranteed". Prediction markets on Polymarket US and Kalshi list weather and climate contracts; check each app for the current listings and prices.
Key takeaways
- NOAA status (8 October 2026): El Niño Advisory, with El Niño strengthening.
- NOAA expects a strong to very strong El Niño through January to March 2027.
- Impacts are more likely but not guaranteed, NOAA says. Not every El Niño winter is wet in California.
- NOAA's next ENSO update is on 12 November 2026.
- Prices move every day, so we don't type them here.
What to watch
- NOAA's monthly ENSO update (next: 12 November 2026).
- The California Department of Water Resources snow surveys from January 2027.
- CAL FIRE's seasonal outlooks.
How weather contracts settle
An ENSO contract usually settles on an official NOAA number or announcement, such as the Oceanic Niño Index for a three-month period. A "Yes" contract pays $1 if the stated condition is met and $0 if not. Read each market's rules for its exact data source and date before you trade.
Where Californians can trade weather markets
- Polymarket US (opens in a new tab): event markets in US dollars.
- Kalshi (opens in a new tab): a CFTC-regulated exchange with weather and climate markets.
These apps are available to eligible California residents. The platforms' minimum age is 18; we recommend 21+. Trading involves risk; you can lose what you put in.
Sources & references
- NOAA Climate Prediction Center: ENSO diagnostic discussion, 8 October 2026 (opens in a new tab)
- CAL FIRE: statewide fire statistics (opens in a new tab)
- California Department of Water Resources: snow surveys (opens in a new tab)
- Commodity Futures Trading Commission: press releases (opens in a new tab)
External links open in a new tab.
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18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
Last checked October 27, 2026
Frequently asked questions
Is there an El Niño in 2026?
Yes. NOAA's Climate Prediction Center had an El Niño Advisory in place on 8 October 2026 and said El Niño continues to strengthen.
Does El Niño always mean a wet California winter?
No. NOAA says the chances of El Niño impacts are larger this winter, but not guaranteed.
Are there prediction markets on El Niño?
Weather and climate markets appear on Kalshi and Polymarket US. Listings change, so check each app for current ENSO contracts.
21+ · T&Cs apply · Terms
18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
