Arabica up, Robusta pressured: Conab's August 17-21 market report and what it signals for Ugandan lots
By Sandra Nansbuga
Arabica up, Robusta pressured: Conab's August 17-21 market report and what it signals for Ugandan lots
Brazil's Conab reported contrasting moves for the week of August 17-21, 2026: arabica prices kept climbing on firm global demand, tight inventories and El Niño concerns for the 2026/27 crop, while robusta (conilon) prices came under pressure on expectations of a record Vietnam harvest. For buyers sourcing East African robusta, the divergence matters because the same supply wave that is weighing on London futures is set to widen the gap between global robusta supply and the premium lots Uganda can command.
According to IndexBox, which summarized the Conab report, arabica prices rose for another week in the domestic Brazilian market, supported by higher New York futures and a stronger U.S. dollar against the real, alongside the seasonal decline in the local harvest. Conilon prices, by contrast, followed the decline in robusta futures on the London exchange, pressured by increased production in major growing countries, especially Vietnam and Brazil.
The bearish driver for robusta is supply. Vietnam, the world's largest producer of Coffea canephora, is heading into a crop concentrated between October and January, and the USDA Foreign Agricultural Service forecasts Vietnam's 2026/27 production at 32.5 million bags green bean equivalent, up from the prior season on production expansion driven by the 2024-2025 price peaks. Brazil's own conilon output is also rising, with Conab's 2026 harvest survey forecasting a record national crop of 66.7 million 60-kg bags, including roughly 20.9 million bags of robusta/conilon.
The supply picture sits inside a broader record-setting season. The USDA projects world coffee production for 2026/27 at 189.7 million 60-kg bags, up 6.1% from the prior season and the highest on record, with global consumption forecast at 179.7 million bags, a 3.6% increase and a new all-time high. Initial stocks for the season are estimated at 24.4 million bags, up 10.7% from the prior cycle's opening inventory, which had been the lowest in 25 years, while final stocks are projected at 26.3 million bags, up 7.8% year-on-year.
Brazil's export data reinforce the momentum. Preliminary figures from Brazil's Ministry of Development, Industry, Trade, and Services (MDIC) cited by IndexBox show average daily exports of unroasted coffee reached 10.2 thousand tonnes in the first fifteen business days of August, up 50.7% compared with August 2025. Cumulative exports from January to July 2026 totaled about 20.8 million 60-kg bags, down 12.2% from the same period in 2025, with export value near US$ 7.5 billion, a decline of 16.3%.
What this means for buyers
For importers and roasters contracting Ugandan robusta, the takeaway is that the global robusta complex is entering a season of ample supply, and that pressure is transmitted to East African differentials even though the Conab report does not quote specific East African or Uganda figures. When Vietnam's record crop lands between October and January and Brazil's conilon keeps flowing, buyers gain negotiating room on robusta basis, and sellers of premium East African lots face a harder argument for wide differentials.
That argues for disciplined procurement timing. If your contract book allows it, consider locking robusta coverage closer to the October-January Vietnam harvest window, when physical supply is most abundant and differentials tend to compress. For arabica, the opposite logic applies: tight inventories, El Niño risk to the 2026/27 cycle and firm New York futures suggest arabica coverage is better secured earlier rather than later, and the arabica-robusta spread is likely to stay wide.
Uganda's position is nuanced. The country benefits from the same firm global demand and record consumption that is lifting the whole market, and its arabica is well placed in a firm arabica environment. But its robusta competes directly with the Vietnam and Brazil supply wave, so Ugandan robusta differentials are the most exposed line in the book. Buyers should separate the two origins in their planning: treat Ugandan arabica as a firm, tight-supply asset, and treat Ugandan robusta as a value play that rewards patient, windowed buying rather than front-loaded commitment.
Finally, watch the currency and logistics layers. A stronger U.S. dollar against the real supported Brazilian arabica prices, and dollar strength generally works against sellers of dollar-denominated East African coffee by making it more expensive in local terms. Factor freight and the seasonal shipping window into any robusta commitment, since the October-January supply surge coincides with peak East African export logistics.
FAQ
Why did arabica and robusta prices move in opposite directions in the week of August 17-21, 2026? Conab reported arabica rising on firm global demand, tight inventories and El Niño concerns for the 2026/27 crop, while robusta (conilon) fell on expectations of a record Vietnam harvest and increased production in Vietnam and Brazil, per the IndexBox summary of the Conab report.
How large is Vietnam's forecast 2026/27 crop? The USDA FAS forecasts Vietnam's 2026/27 production at 32.5 million bags green bean equivalent, up from the prior season, with the crop concentrated between October and January.
Does the Conab report quote specific East African or Uganda robusta differentials? No. The report covers global and Brazil domestic dynamics; the East African differential pressure described here is an analytical implication of the global robusta supply wave, not a figure from the report.