Highest temperature in Sao Paulo on July 23?

Platform comparison

Market context

The contract is pricing **0% YES** on Polymarket, so the market is effectively saying there is no credible path to the Sao Paulo–Guarulhos Airport station finishing its day with the highest temperature inside the event’s settlement band. Because settlement is tied to the *single highest recorded temperature* on 23 July 2026, not the daily average or the afternoon forecast, traders are really judging whether a short-lived spike at the airport can beat the surrounding temperature ranges after fees, slippage, and the fact that positions are held in **USDC on Polygon** via conditional tokens.

For context, late-July weather in São Paulo is usually shaped by its southern-hemisphere winter pattern rather than heat extremes, so the market tends to hinge on whether an unusually warm air mass reaches the city at all. That makes the relevant comparison less about headline “hot day” language and more about whether the airport’s measured maximum can jump far enough above its normal seasonal band to move into a higher temperature bucket. In prediction-market terms, a 0% print often reflects thin liquidity as much as certainty, so the more useful signal is whether that quote changes once the day’s temperature range becomes clearer.

A trader should watch the airport forecast updates, the timing of the warmest part of the day in local time, and any regional weather alerts that could shift cloud cover, wind, or rainfall before the measurement window closes. The key dependency is the Wunderground reading for Sao Paulo–Guarulhos International Airport, since that value alone determines settlement; if the station logs an isolated peak before the cutoff, the market resolves on that observation regardless of what broader city forecasts say.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram. 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.

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.

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.