Highest temperature in Sao Paulo on July 6?

Platform comparison

Market context

The highest temperature recorded at São Paulo-Guarulhos International Airport on 6 July 2026 is the real-world event this market resolves, yet Polymarket prices the YES outcome at 0% today, implying traders deem any extreme heat impossible for this date. This near-zero valuation contrasts sharply with historical patterns where July in São Paulo typically sees daytime highs around 22–24°C, with the warmest day of the month averaging 22.7°C on 3 July[2][4]. While Rio de Janeiro recently experienced perceived temperatures reaching 62°C during a severe heat wave, such extremes are geographically isolated and not representative of São Paulo’s cooler, more humid winter climate[1]. The 0% price likely stems from a misunderstanding of regional variability rather than a genuine forecast of cold conditions, as even the coldest July days in São Paulo rarely dip below 16°C at night[2].

Traders should monitor upcoming weather model updates from the MWF system, which projects dry and hot conditions in Brazil’s central regions but rain along coastal edges and cooler temperatures in the south[3]. No official announcements or scheduled dependencies currently threaten to alter this outlook, but sudden shifts in the Southern Oscillation could trigger unexpected warmth. Recent news from DW highlights that Brazil’s heat waves are intensifying, yet these events remain concentrated in Rio and the north, not São Paulo[1]. The conditional tokens on Polygon, settled in USDC, will resolve based on Wunderground’s recorded maximum for the day, making real-time data from the airport station the sole catalyst for price movement. Until new forecasts emerge, the market’s 0% pricing reflects a cautious, data-driven stance rather than an arbitrary dismissal of potential volatility.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Sao Paulo on July 6? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.