Highest temperature in Beijing on July 21?

Platform comparison

Market context

On 21 July 2026, Beijing's highest temperature will be recorded at Capital International Airport Station and fall into one of several defined ranges. The Polymarket contract currently shows 0% implied probability across all temperature brackets, a pricing anomaly typical of illiquid weather derivatives where no trader has yet committed USDC collateral to establish a floor. The settlement mechanism uses Wunderground's historical data feed for that specific station, converting the daily high into Celsius and resolving to whichever range contains the recorded value. Traders holding the correct conditional token on Polygon will claim the pool; incorrect positions expire worthless.

Beijing's July climate is remarkably consistent year-on-year. Historical records from the past decade show highs clustering between 32–35°C during mid-summer, with extreme outliers rare. The 2022 heatwave pushed temperatures to 40.3°C, but such events occur roughly once per decade. Most July 21st observations fall within the 33–34°C band, suggesting that range should command the largest share of liquidity once trading begins. The absence of current pricing reflects the contract's early stage rather than genuine uncertainty about whether a temperature will occur.

Catalysts affecting the outcome include the East Asian summer monsoon pattern, which typically moderates Beijing temperatures in late July, and any anomalous high-pressure system that might stall over northern China. The China Meteorological Administration publishes seasonal forecasts quarterly; their April 2026 outlook will be the most relevant signal for traders positioning ahead of settlement. Extreme heat events are often preceded by 10–14 day forecasts from international models, giving late-month traders actionable data.

Methodology

We track Highest temperature in Beijing on July 21? 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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? 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.