Dry Spell in Brazil’s Key Soybean Belt Threatens Soil Moisture for 2024/25 Planting

Brazil’s principal soybean producing regions are facing a critical lack of rainfall in late July, a weather pattern that poses a risk to the soil moisture needed for the start of the 2024/25 planting season. Regions across Mato Grosso, Goiás, and Bahia—which together anchor the massive Brazilian soybean crop—have registered seven consecutive dry days with negligible precipitation. Specifically, Sorriso-MT, the nation's soybean capital, recorded just 0.1mm of rain over seven days, while major hubs like Rio Verde-GO and Luís Eduardo Magalhães-BA reported 0.0mm over the same period.

While planting for the new main crop (safra) does not begin until the phytosanitary "sanitary void" period lifts in September, the current dry spell is a pre-planting risk, as producers rely on the return of seasonal rains to ensure adequate soil moisture for sowing. A delayed or dry start to the planting window in September would not necessarily reduce the total planted area, but it significantly raises the risk profile for the crop by potentially delaying the crop cycle. This delay would in turn compress the critical planting window for the high-value second-crop (safrinha) corn that follows, which is highly dependent on timely planting to avoid the later dry season.

The renewed focus on South American weather comes as the Chicago Board of Trade (CBOT) soybean futures are already sensitive to supply concerns, with November contracts recently trading near $12.20 per bushel following earlier weather-driven gains and strong demand. Speculative investors are firmly positioned on the bullish side, with the latest Commitment of Traders (COT) report showing a net long position of 113,860 contracts, indicating a market psychology quick to react to any tightening of the global supply outlook. Furthermore, any disruption to Brazil’s agricultural exports—the world’s largest soybean supplier—could put upward pressure on the US Dollar against the Brazilian Real (USD/BRL), particularly if global supply fears drive international flows away from emerging market assets.

Market participants will be closely monitoring rainfall forecasts for the next four to six weeks, particularly in Mato Grosso, where the sanitary void is set to lift in early September, signaling the start of the $50 billion crop cycle. Sufficient moisture in the soil is required for farmers to feel confident planting millions of hectares. Should the dry conditions persist into the final weeks of August, the likelihood of a delayed planting start, and consequently increased volatility in CBOT soybean futures, will sharply rise.