Dry August in Brazil’s Grain Belt Risks Soybean Planting Delays, Threatening Global Safrinha Corn Supply

An extended period of dry weather in Brazil's most important soybean-producing regions is draining pre-season soil moisture and raising concerns over the start of the 2026/27 planting cycle, putting a new record harvest projection at risk. Key cities in the central grain belt, including Sorriso in Mato Grosso and Rio Verde in Goiás, have registered zero rainfall over the last seven days, remaining at 0.0mm. Luís Eduardo Magalhães in Bahia, a crucial production area in the Northeast, is also in a seven-day dry spell with 0.0mm of accumulated rain.

While August is typically part of the dry season for the Center-West, the current moisture deficit is critical because soybean farmers in the Cerrado biome rely on the return of consistent rain in September and October to begin planting in earnest. The world's largest producer and exporter of soybeans, Brazil soybean production is concentrated in states like Mato Grosso, where Sorriso is located, and Goiás, where producers wait for a certain threshold of rain—often 50mm—to ensure proper seed germination. Without an adequate soil moisture base, a delayed start to planting becomes inevitable, which threatens the efficiency of the entire agricultural calendar.

The most significant knock-on effect of a soybean planting delay is the compounding risk it poses to the second-crop corn, known as safrinha. The safrinha crop, which accounts for up to three-quarters of Brazil’s total corn output and is a major component of the global grain supply, is planted immediately after the early soybean harvest. A delayed soybean harvest pushes the planting of safrinha corn later in the season, exposing the developing crop to a higher probability of hot, dry weather before it reaches maturity, which in turn leads to lower yields.

Agricultural agencies are currently forecasting another record-setting season, with the National Supply Company (CONAB) estimating a total Brazil soybean crop of 180.464 million tons, an all-time high. However, this optimistic outlook hinges on favorable weather for planting and development. The dry conditions contrast with the milder situation in the south, where Cascavel in Paraná has registered 4.7mm over the last six dry days. The focus now shifts to the weather forecasts for September, as a continued lack of rain will force a difficult decision for farmers: plant into dry soil, risking crop failure, or wait, thus cutting into the vital window for safrinha corn.

What it touches The threat of tighter future supply due to a potential Brazil weather risk in the 2026/27 season is providing support to futures markets, with Soybean futures trading 1.97% higher at 1216.0 cents per bushel. The Brazilian real (BRL) is trading at 5.2008 per US dollar, a daily appreciation of 0.45%, following the general trend of stability.