Pronóstico: Highest temperature in Sao Paulo on August 7?

Platform comparison

Market context

Today’s Polymarket contract is effectively pricing a **25°C** top reading at São Paulo-Guarulhos Airport, even though the event settles from Weather Underground’s **Daily Observations** table rather than a headline daily high. With the market currently showing **0% YES**, the contract is behaving as if the final observed maximum is already viewed as outside the priced range or not yet reflected in the order book, which is unusual but possible in low-liquidity, near-settlement weather markets on Polygon using USDC and conditional tokens.[6][12]

For context, São Paulo in August is normally a mild winter market rather than a heat-extreme market. Seasonal guides put typical daytime highs around **23–25°C**, with averages near **25°C** and plenty of days clustering in the low-to-mid 20s rather than anything markedly hotter.[7][14][1] Comparable local forecasts for 7 August 2026 from Brazilian and international weather sources cluster around **25–27°C** for the city, which is consistent with a modest spread around the market’s main bucket and suggests that the decisive question is not whether it will be warm, but whether the airport station’s observed maximum lands in the exact resolution band.[3][13][16]

The key trading catalysts are the **final airport observations** and any **late revision window** before the first datapoint for 8 August is published, because the market rules allow temperature revisions within the settlement window until that next-date datapoint appears.[6] Traders should watch the Weather Underground station feed for **Sao Paulo-Guarulhos International Airport**, alongside the broader synoptic set-up: CGE reported a cold front moving along the São Paulo coast with cloud, isolated showers and gusty winds later on 7 August, while airport and city forecasts still pointed to a daytime peak near the mid-20s.[3][12][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Sao Paulo on August 7? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Qué Es, which mirrors the Polymarket order book at 0% fees.

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.

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.

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 Polymarket Qué Es trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.