Latin American FX: Real, Peso and Andean Currencies — 2026-09-18

Top developments

Brazil's Selic Cut vs. Fed Hike Narrows Carry Cushion

On September 16, 2026, Brazil’s Copom unanimously cut the Selic rate to 13.75% from 14%, coinciding with a Federal Reserve rate hike. This simultaneous move significantly narrowed the interest rate differential between Brazil and the US, reducing the attractiveness of carry trades in the Real. The Real closed near R$ 5.15, with market participants watching for further volatility as the "carry cushion" shrinks.

Mexican Peso Weakens as Rate Gap Hits Record Low

The Mexican Peso (MXN) depreciated to approximately 17.56 per dollar on September 16, following the Fed's rate increase. The widening divergence between Banxico’s steady 6.5% rate and the Fed’s higher policy rate has created a record-low rate gap, putting pressure on the Peso ahead of Banxico’s next meeting on September 24. Local analysts note that the MXN is struggling to maintain gains against the stronger dollar index.

Colombian Peso Leads Emerging Markets with 19.3% Gain

In a standout performance, the Colombian Peso (COP) has appreciated 19.3% against the dollar between January and September 2026, making it the best-performing currency among 21 monitored emerging markets. This revaluation is largely driven by strong carry trade inflows and relative macroeconomic stability compared to regional peers. The TRM (Taxa de Representação Média) stepped up to 3,109.3 COP per dollar earlier in the week, reflecting this sustained strength.

Argentina's Blue Dollar Gap Narrows to Under 3%

The spread between Argentina's official and blue dollar rates narrowed to 2.98% on September 17, as the blue dollar fell to ARS 1,555 while the official rate held at ARS 1,510. The Central Bank of Argentina (BCRA) has reduced its reserve purchases to minimal levels, effectively allowing the parallel market to converge closer to the official rate. Net reserves reached their highest level since 2021, approaching US$7 billion, though market observers warn of limited intervention power.

Local view

Valor Econômico reports that the Brazilian market is in a state of "wait-and-see," with the Real showing stability despite the global tightening cycle. The outlet highlights that the market had priced in both the Fed hike and the Copom cut, leading to muted immediate FX reactions but increased scrutiny on future guidance.

El Financiero (Mexico) notes that the Peso "retreated" in electronic trading post-Fed decision, with bank counters quoting the dollar at 17.56 pesos. Analysts cited by the outlet emphasize that the narrowing rate differential is the primary driver of the MXN's recent weakness.

La República (Colombia) celebrates the Colombian Peso's status as the "leader" of emerging market revaluation, attributing the 19.3% YTD gain to effective monetary policy and attractive yields that continue to draw foreign capital despite global volatility.

Context & numbers

• Brazil: Selic rate cut to 13.75% (from 14%). USD/BRL closed near R$ 5.15. International reserves stood at US$369.7 billion in July.
• Mexico: Banxico rate at 6.5%. USD/MXN spot rate approx. 17.56. Next Banxico meeting scheduled for September 24.
• Colombia: COP appreciated 19.3% YTD. TRM reference rate around 3,109.3.
• Argentina: Blue dollar at ARS 1,555; Official at ARS 1,510. Brecha (gap) at 2.98%. BCRA net reserves near US$7.0 billion.
• Cross Rates: BRL/MXN ~3.29; BRL/CLP ~174.66; COP/BRL ~0.0014.

On the radar

• Banxico Meeting: September 24, 2026. Markets will watch for any shift in tone given the record-low rate gap with the Fed.
• Chilean Holidays: Chile's exchange is closed for Fiestas Patrias until late September, limiting CLP liquidity and price discovery.
• Argentina Trade Data: August trade figures are due for release, potentially impacting BCRA's reserve accumulation capacity.
• Global Carry: With the Fed hiking and Brazil cutting, investors are reassessing exposure to BRL versus higher-yielding assets in other emerging markets like Poland or Hungary.