Brazil’s Wet Onion Season: Weather Risks Build but Prices Stay Soft

Planting for Brazil’s 2026/27 onion crop in São José do Norte is advancing despite excess rain, high humidity and rising disease pressure. Short‑term physical damage is limited so far, but persistent cloud cover and forecasts of a strong El Niño keep yield and quality risks elevated into harvest. Global onion and onion‑product prices in EUR remain slightly softer for now, but the Brazilian weather story could become a bullish driver later in the season. In the key producing area of São José do Norte, July rainfall reached about 192 mm, roughly 68% above the historical average, causing localized flooding in onion fields. Growers report that waterlogging has not yet translated into major stand losses, but they are increasingly concerned about bacterial diseases encouraged by prolonged humidity and reduced sunlight. With planting still ongoing and harvest only starting in November, the final outcome will depend heavily on late‑winter and spring weather in southern Brazil and the realization of the anticipated El Niño pattern. Internationally, current EUR‑denominated offers for fresh and processed onions point to marginally easing prices, leaving room for weather‑driven risk premia if Brazilian crop prospects deteriorate.

Prices

Latest indicative export offers in EUR for key onion products show a mild downward trend over recent weeks, suggesting comfortable nearby availability:

The modest softening (around EUR 0.02/kg across several lines) indicates that, despite emerging weather concerns in Brazil, physical markets for fresh and dehydrated onions remain well supplied at the start of August.

Supply & Demand

In São José do Norte, a core onion hub in Rio Grande do Sul, planting for the 2026/27 season continues under unusually wet conditions. July rainfall of about 192 mm – roughly two thirds above normal – led to local flooding but, according to producers, has not yet caused significant stand loss. Direct sowing is practically finished, while transplanting of seedlings is set to continue until mid‑September, keeping the sowing window open for another month.

First harvests in the region are scheduled for November, implying that current conditions mainly affect vegetative growth and early bulb initiation. Until then, disease pressure, soil moisture management and sunlight availability will be decisive for final yields and grading. Globally, Egyptian exports and stable processed onion supply from India and Eastern Europe continue to underpin export availability, limiting immediate upward pressure on EUR prices even as Brazil’s crop moves through a high‑risk development phase.

Fundamentals & Weather Risks

Persistent humidity in São José do Norte is fostering bacterial diseases in onion fields. Growers have intensified phytosanitary treatments to contain outbreaks, but continued wetness could raise input costs and still compromise bulb quality, storability and shelf‑life. Prolonged cloud cover is another key concern, as reduced solar radiation limits photosynthesis, potentially reducing bulb size and increasing the share of out‑of‑spec onions at harvest.

Farmers are also watching forecasts for a strong El Niño toward late 2026. A repeat of the excessive rainfall and flooding seen in the 2023/24 season in Rio Grande do Sul would increase the risk of field losses and downgraded quality, particularly for late‑harvested lots. At this point, the current crop still has time to recover if late winter and spring turn drier and sunnier, but the balance of risk has shifted mildly bullish for the medium term, even if spot and near‑term prices remain subdued.

Trading & Price Outlook

• Short term (next 1–2 weeks): With global supplies adequate and Brazil’s crop risks still largely hypothetical, EUR prices for fresh and processed onions are likely to remain in a narrow, slightly soft range.
• Medium term (Q4 2026): As Brazilian fields move into bulb formation and approach the November harvest, any confirmation of yield or quality issues in São José do Norte could support a firmer tone, especially for higher‑grade fresh onions and quality‑sensitive processed products.
• Risk management: Buyers with exposure to late‑2026 deliveries may consider gradually extending cover at current price levels, while maintaining flexibility to respond to updated Brazilian weather and disease reports.

3‑Day Directional Outlook (EUR Markets)

• Fresh export onions (Egypt, FOB EUR): Sideways to slightly softer; competition among exporters remains strong.
• Indian onion powder & flakes (FOB EUR): Stable with a mild downward bias as recent offers edge lower.
• Processed/fried onions (Europe, FCA EUR): Largely flat; no immediate fundamental trigger for sharp moves expected in the next three days.