Highest temperature in Sao Paulo on July 6?

Platform comparison

Market context

The contract for the highest temperature in São Paulo on 6 July 2026 currently trades at 0% probability for any “YES” outcome, reflecting the market’s absolute confidence that temperatures will not breach the implied threshold. This pricing sits on the Polygon blockchain, settled in USDC, where conditional tokens lock in the binary resolution based on Wunderground’s official daily high for the Guarulhos International Airport station.

Historically, early July in São Paulo delivers afternoon highs between 18°C and 22°C, with most readings clustering around 20°C to 21°C, as seen in comparable early-July forecasts for 2026[8]. While Brazil recently experienced a severe heat wave with Rio de Janeiro recording a perceived temperature of 62.3°C, this extreme was a perceived index, not an actual air temperature, and occurred in a different coastal region with distinct microclimates[1][9]. São Paulo’s own July averages remain firmly in the 22°C to 23°C range, rarely exceeding 29°C, making a breach of the threshold highly improbable under normal seasonal conditions[2][4].

Traders should monitor the upcoming Brazil National Meteorology Institute (INMET) weekly bulletins and any sudden shifts in the South Atlantic High-pressure system, which could alter cloud cover and wind patterns. Although no immediate heatwave announcements have been issued for São Paulo this week, the broader regional heat anomaly warrants caution; however, current forecasts for July 2026 still project daily highs between 66°F and 78°F (19°C to 26°C), well below extreme thresholds[3]. The settlement dependency on Wunderground’s verified data ensures that only actual recorded highs—not perceived indices—will determine the outcome, further anchoring the 0% probability.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Scam?. 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.

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.

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.