Highest temperature in Sao Paulo on July 9?

Platform comparison

Market context

The underlying event is the peak daytime temperature recorded at São Paulo-Guarulhos International Airport on 9 July 2026, measured in degrees Celsius. Historical data frames this as a low-probability outcome for a 23°C hit, given that July is São Paulo’s coldest month, with average highs near 22°C (72°F) and lows around 13°C (56°F)[2]. While July 2023 was the hottest July in 174 years globally, São Paulo’s local record for the month remains modest, and recent extreme heat events in Brazil—such as Rio’s 39°C street reading in 2024—have not translated to sustained high temperatures in São Paulo during winter months[1][3]. The crowd-implied 0% YES probability aligns with analyst consensus that 23°C is an unlikely threshold for this date, despite occasional spikes.

Traders should monitor the upcoming release of Wunderground’s daily high for SBGR on 10 July, which will confirm the actual peak temperature for 9 July and settle the market[9]. No formal weather announcements are scheduled, but dependencies include regional cloud cover and wind patterns typical of São Paulo’s dry winter season. Recent visual data shows temperatures reaching 80.6°F (27°C) in late June 2026, suggesting that while summer peaks are higher, July remains thermally constrained[4]. The divergence between cross-platform odds is minimal: prediction markets and sportsbook lines both treat 23°C as a near-impossible event, with no meaningful analyst consensus supporting a YES outcome. This contract offers little speculative value unless an unexpected microclimate 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 PolyGram, 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 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.

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