Highest temperature in Sao Paulo on July 9?

Platform comparison

Market context

Sao Paulo is entering its coldest month, with July historically delivering average highs near 22°C (72°F) at the Guarulhos station, framing the current 0% crowd-implied probability for any temperature spike above this baseline[3]. Recent data from late June and early July 2026 shows peaks barely reaching 27°C (80.6°F), reinforcing the consensus that stable winter high pressure will keep afternoon highs tightly clustered between 22°C and 24°C[5]. While July 2023 was the hottest in 174 years globally, local records for São Paulo in July remain modest, making extreme deviations highly improbable and positioning the 22°C outcome as the dominant favourite with 98% implied probability[1][2].

Traders should monitor the daily Wunderground updates for the Guarulhos station, as the market resolves strictly on the highest recorded temperature for all times on 9 July 2026[1]. No major weather announcements or climate schedules are expected to disrupt this pattern, given the stable atmospheric conditions predicted by major centres for the date[1]. The value spot lies contrarianly in the 23°C range, which currently sits at less than 1% despite recent models suggesting afternoon highs could touch 24°C, offering a slight underdog opportunity if cloud cover clears unexpectedly[1]. However, the consensus remains firmly on 22°C, with the 23°C outcome acting as a distant underdog with negligible value unless a sudden heat anomaly occurs.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Sao Paulo on July 9? 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 Who Will Win, 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 Who Will Win. 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.

Do I need to KYC for this market?

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

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.