Coffee Futures Climb as Brazil Faces Weather Woes and Tariff Threats

Coffee prices are climbing fast this week, driven by a combination of severe weather in Brazil and rising trade tensions. September arabica coffee (KCU25) is up +1.26% while September robusta (RMU25) has surged +3.44%, as the global market reacts to shifting supply fundamentals and speculative pressure.

🌩️ Weather Damage in Brazil Sparks Supply Concerns

A recent hailstorm in Brazil’s Minas Gerais region—home to the country’s largest arabica coffee production—has raised fears of crop damage. According to Sucden Financial, the impact could disrupt already tight global supplies, especially with Brazil nearing the final stages of its 2025/26 harvest.

Adding to the volatility, markets are closely watching trade talks between the U.S. and Brazil. If a deal isn’t reached by Friday, Brazilian exports could face a 50% tariff—potentially driving prices even higher and limiting shipments from the world’s largest arabica exporter.

📉 Speculators Add Fuel to the Fire

Robusta coffee is seeing outsized moves, partly due to fund positioning. Traders added more than 3,300 net short positions in the latest reporting week, pushing total managed money shorts to a two-year high. Any hint of bullish news could trigger a wave of short covering and amplify upward price momentum.

🚜 Harvest Pressure Collides with Export Drop

Brazil’s 2025/26 coffee harvest is nearing completion, with 84% of the crop already collected—outpacing both last year’s 81% and the 5-year average of 77%. Robusta harvesting is almost complete at 96%, while arabica sits at 76%. Yet despite this seasonal pressure, recent export data paints a different picture.

Green coffee exports in June plunged 31% year-over-year, according to Cecafe. Robusta exports were down 42%, and arabica fell 27%, suggesting a tightening global supply pipeline even as harvest volumes rise.

🌧️ Rainfall Offers Some Relief—But Is It Too Late?

Weather models show that Minas Gerais received 3.5 mm of rain last week—more than double the seasonal average. While welcome, this moisture arrives late in the season and may do little to reverse hail damage or offset harvest delays. Nonetheless, improved soil moisture could help support the next crop cycle.

🌍 A Global Coffee Market in Transition

The broader outlook for coffee remains mixed. The USDA’s latest biannual report forecasts global production to rise +2.5% year-over-year to a record 178.68 million bags in 2025/26. Robusta output is expected to jump nearly 8%, while arabica is forecast to dip slightly.

Vietnam—robusta’s top producer—is rebounding from last year’s drought-stricken crop, which fell 20% year-over-year. Coffee exports from Vietnam rose 4.1% in the first half of 2025, while production estimates for the upcoming season have been revised slightly lower to 26.5 million bags.

📊 Snapshot: What’s Driving the Market?

Between unpredictable weather in Brazil, speculative dynamics in the futures markets, and a fragile trade backdrop, the global coffee market is entering a period of heightened volatility. Whether this turns into a sustained rally or a short-covering blip may depend on what happens in Washington by week’s end—and in the skies over Minas Gerais.