SF Fed: El Niño could add up to 1 point to US inflation in 2027

What happened. El Niño is a warming of Pacific waters that shifts weather around the world. The SF Fed letter says the current episode is "very strong" and NOAA's forecast is above every past case in their data. The authors studied how episodes since the 1950s affected US prices and jobs.

What they found. El Niño lifts prices for a while in its first summer, and that usually reverses by January. They estimate it added about 0.3 percentage point to the PCE price index from April to July 2026. In 2027 the effect could be about 1 point if La Niña follows. The rise comes mostly from services and food. Jobs grew in the second year of past episodes, with or without La Niña.

Why be careful. The authors say plainly this is not a forecast but a "meaningful risk". The data hold only 22 El Niño episodes, and only 4 very strong ones. The current one is stronger than all of them, and the model assumes the effect grows in line with strength. Without La Niña in 2027 the model sees no further price rise.

Why it matters to you. The Fed watches PCE inflation. If weather pushes prices up in 2027, the Fed has fewer reasons to cut rates. That moves bond yields, the dollar and risk assets. Food and services are the costs people notice first.

What is not known. Whether La Niña arrives in 2027. Whether a strong El Niño causes disasters the model does not cover. The authors' views are not necessarily the Fed leadership's. This is an overview, not advice.

Confirmed facts

• The San Francisco Fed published Economic Letter 2026-31 on the impact of El Niño on the US economy on November 2, 2026.^[1][2]
• The authors estimate the current El Niño added about 0.3 percentage point to the PCE price index from April to July 2026, an effect expected to fade by year end.^[1]
• The model points to a rise of about 1 percentage point in PCE prices over 2027 if La Niña follows.^[1][2]
• Price rises in past episodes were driven mainly by core services and food.^[1]
• Employment was flat in the first year of past episodes and rose in the following year.^[1]
• The sample since the 1950s has 22 El Niño episodes, 4 of them very strong; the current one is projected to be stronger than any.^[1]
• The authors call the result a meaningful risk of higher inflation in 2027, not a forecast.^[1][2]

Implications

• ConfirmedFed researchers see a weather risk for inflation in 2027.
• Our readingIf the risk plays out, the Fed may keep rates high for longer. This is our view.
• Our readingFood and farm commodity prices may matter more to markets in 2027. This is our view.

Still unknown

• Whether La Niña arrives in 2027
• How strong the current El Niño turns out
• Whether Fed leadership factors in this risk

Who it affects

USA, World. People who follow inflation, Fed rates and food prices

Sources

1. Federal Reserve Bank of San Francisco: The Impact of El Niño on the U.S. Economy November 2, 2026 · official
2. Reuters: El Nino poses 'meaningful risk' of higher inflation in 2027, SF Fed paper says November 2, 2026 · media