Latin American FX: Real, Peso and Andean Currencies — 2026-09-16
Latin American currencies are bracing for a "Super Wednesday" of divergent monetary policy, with the Brazilian Real hitting a two-week low ahead of Copom’s expected rate cut and the Fed’s anticipated hike. The Mexican Peso breached the 17-per-dollar threshold as US yields surged to 2007 highs, while Argentina’s blue dollar widened its gap to official rates amid falling central bank reserves.
Latin American FX: Real, Peso and Andean Currencies — 2026-09-16
Top developments
Brazil’s Real Hits Two-Week Low Ahead of Copom
The Brazilian Real weakened significantly, with the PTAX fixing at 5.1690 per dollar on Monday, marking a two-week low driven by rising US Treasury yields. As Wednesday approaches, markets are pricing in a 95% probability of a 25 basis point cut to Brazil's Selic rate to 13.75%, contrasting sharply with expectations for a Fed hike to 4.00%. This divergence is compressing carry trade dynamics, prompting investors to adjust positions before the Banco Central do Brasil’s decision. The real traded around R$ 5.16 on Tuesday, showing slight recovery but remaining volatile as traders digest political risks involving the Supreme Court (STF).
Mexican Peso Breaches 17 Per Dollar on US Yield Surge
The Mexican Peso depreciated to 17.14 per dollar on Tuesday, breaking the psychological barrier of 17 units due to fears over the Federal Reserve’s potential rate hike. The US 10-year yield touched 5.01%, its highest level since 2007, intensifying capital outflows from emerging markets like Mexico. In retail windows, the dollar was quoted at 17.56 pesos, reflecting the widening spread between interbank and consumer rates. This move underscores the vulnerability of LatAm currencies to US monetary tightening, especially as Banxico maintains a 6.5% rate against the Fed’s current 3.5%, though the gap is expected to narrow if the Fed hikes.
Argentina’s Blue Dollar Widens Gap as Reserves Drop
In Argentina, the informal "blue" dollar rose to 1,560 pesos per dollar on Tuesday, while the official wholesale rate held steady at 1,506 pesos, widening the currency gap to approximately 3.6%. The Central Bank of Argentina (BCRA) reported a loss of USD 322 million in reserves over five trading days, with gross reserves falling below USD 50 billion. Despite the BCRA’s limited intervention, purchasing only USD 12 million recently, the parallel market remains under pressure as inflation expectations keep the demand for hard currency elevated.
Local view
Valor Econômico highlights the "opposite steps" being taken by Brazil and the US, noting that with both moves largely priced in, attention is shifting to the communication from both central banks. Meanwhile, El Financiero in Mexico describes the peso’s reaction as a "scare" driven by the Fed announcement, emphasizing that the break below 17 pesos is a technical warning sign for further depreciation. In Argentina, Ámbito Financiero notes that the blue dollar reached two-week highs, signaling that local investors are hedging against devaluation risks despite official stability.
Context & numbers
- Brazil (BRL): PTAX fixed at 5.1690; spot around R$ 5.16. Expected Selic cut to 13.75%.
- Mexico (MXN): Closed at 17.14 per dollar; retail window at 17.56. Banxico rate at 6.5%.
- Argentina (ARS): Official wholesale at 1,506; Blue at 1,560. Gross reserves below USD 50 billion.
- Colombia (COP): TRM (Tax Rate of Change) stepped up to 3,109.3 per dollar.
- Chile (CLP): Peso closed at 957.53 per dollar.
On the radar
- Fed & Copom Decisions: Both central banks announce rate decisions on Wednesday, September 16. The Fed is expected to hike to 4.00%, while Copom cuts to 13.75%.
- Mexico Independence Day: Banks and FX fixing mechanisms in Mexico are suspended on September 16 for Independence Day, potentially reducing liquidity and volatility in the MXN market.
- BCRA Reserves: Watch for further depletion of Argentine reserves if the blue dollar gap continues to widen beyond 4%.
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