Pronóstico: Highest temperature in Sao Paulo on July 6?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at São Paulo-Guarulhos International Airport on 6 July 2026, measured in degrees Celsius. Current Polymarket pricing shows a 0% implied probability for the "YES" outcome, reflecting the market’s view that the temperature will not exceed the threshold set for this contract. On-chain, this conditional token trades on Polygon using USDC, where liquidity providers and speculators lock capital into the binary outcome based on Wunderground’s final daily reading.

Historical patterns frame this near-zero probability: São Paulo’s July is its dry winter season, with average highs between 66°F and 78°F (19°C–26°C), rarely exceeding 24°C on early July dates. While Rio de Janeiro recently recorded a perceived 62°C heatwave, São Paulo’s airport station typically registers lower extremes, and the warmest July day in recent years fell on 3 July at 22.7°C. A 24°C threshold is therefore statistically plausible, but the current market implies the actual reading will stay below it.

Traders should monitor the daily weather briefs from AccuWeather and Climate Data for São Paulo, which forecast daily highs up to 24°C for 6 July, alongside any sudden shifts in cloud cover or fog dissipation that could elevate temperatures. The settlement depends entirely on Wunderground’s official record for all times on that day, so real-time updates from the station’s feed are critical. No major announcements are expected, but local meteorological schedules and fog-clearing timelines will determine whether the temperature breaches the threshold before noon UTC.

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Methodology

We track Pronóstico: 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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 reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.