Highest temperature in Sao Paulo on July 23?

Platform comparison

Market context

São Paulo’s airport temperature on 23 July is usually a *winter* reading in the low 20s Celsius rather than anything close to tropical heat. July normals for the city sit around a 23°C daytime high, with averages for the airport area broadly consistent with a mild, cool pattern, so a settlement in the upper teens or low 20s is the base case for any model that maps weather histories into bands.[5][4] With the market resolving off the highest temperature recorded at São Paulo–Guarulhos International Airport, programmatic traders should key off the daily maximum rather than the noon snapshot, because the settlement source explicitly uses the full-day high on Wunderground.[1]

The current 0% implied YES price looks easy to misread if the contract’s strike bands are wide or if “YES” corresponds to a specific threshold rather than the outright daily maximum. For a power user building an automated screen, the useful comparison set is the airport’s own forecast and recent climatology: current live weather pages show temperatures around 21°C to 24°C with modest winds and humidity, while July climatology stays broadly cool and only occasionally warmer.[2][4][5] On the other hand, the forecast for São Paulo does show some precipitation around 23–25 July, which can trim daytime heating, although a wet forecast does not by itself rule out a late-afternoon spike in the max.[1]

The main catalysts are therefore the airport forecast evolution, any shift in cloud cover or rainfall timing, and intraday updates from the resolution source as the day progresses. A trader running conditional orders or bot logic would typically watch for a warmer-than-expected forecast revision, then compare that against the actual observed maximum at SBGR on Wunderground as the settlement window approaches.[1][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Sao Paulo on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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