Peso Mexicano Hits Weakest Since November 2025 as Dollar Climbs to 18.49

The Mexican peso closed Wednesday at 18.4888 per US dollar, its weakest level since November 2025, after a hot September CPI print lifted the odds of more Federal Reserve rate hikes and shrank the interest-rate advantage that had propped up the currency. The peso fell 0.61% on the day, and brief intraday prints near 18.60 marked the first time the currency had traded that weak since late 2025, according to Banco de México (Banxico) data.

The trigger was Wednesday's US inflation report. The Bureau of Labor Statistics said September consumer prices rose 0.6% from August and 3.7% from a year earlier, a reacceleration that analysts attributed above all to energy. Traders responded by pulling forward bets on Fed tightening, and the dollar gained broadly against emerging-market currencies. The peso, which extended a two-week slide, took the brunt.

Related reading: The Fed Hikes Into a 5% 10-Year: Higher-for-Longer Regime.

Gabriela Siller, head of economic analysis at Grupo Financiero Base, told El Financiero that the probability of a 25-basis-point Fed hike before the end of the year rose from 85.6% to 98.1% after the CPI release, and that another three or four quarter-point rises through 2027 would lift the federal funds target to a 4.75% to 5.00% range. That scenario would compress the gap between US and Mexican policy rates to about 150 basis points, assuming Banxico stays at 6.50%.

That narrowing is the core of the peso story. Mexico's central bank has kept its policy rate at 6.50% through the recent stretch, which preserved what was a large yield-carry advantage over a Fed that entered the year near 3.88%, per the Federal Reserve's own ledger. As US rate expectations rose, that cushion thinned and carry traders unwound positions, a dynamic Siller described as leaving the peso oversold in technical terms, with 18.70 the likely next pressure point in coming sessions.

For the broader framework, see our Fed policy coverage.

Related reading: BOJ Hikes to 1.25%: Dollar-Yen Carry Trade Narrowing Rate Gap.

The move is large in context. Banxico's own currency table shows the dollar priced 17.1277 pesos per dollar on September 14, roughly a month ago, versus 18.4888 on October 14, a depreciation of about 7.9% in a single month. From the December 31, 2025 reference of 18.0012, the peso is now roughly 2.7% weaker. On the intraday basis, Siller said the currency has depreciated about 10% from its September low to Wednesday's session peak.

Who feels this most are Mexicans paying dollar-denominated debts, importers, and anyone traveling or remitting across the border, since a weaker peso makes dollars more expensive in peso terms and lifts the local cost of imported goods. With October and December Fed meetings still ahead, and Mexico's own inflation data and Banxico communications due in the interim, the peso remains the clearest public gauge of how the two central banks' policy paths are diverging.

Related reading: The Fed Hiked to 4%. Its Communication, Not the Hike, Is Now the Policy.

In Thursday trading the dollar eased slightly to near 18.44 pesos, according to Yahoo Finance data retrieved October 15, but the currency held near the levels it has defended since Wednesday's close. The next test is whether Banxico breaks its 6.50% hold if the exchange rate keeps pressuring domestic inflation, and whether the Fed follows through on the rate path the CPI has re-priced.

Related reading: JOLTS, PCE and payrolls will test the 66% October hike odds.

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