Highest temperature in Beijing on August 15?

Platform comparison

Market context

Beijing's weather on 15 August 2026 will determine whether the highest temperature recorded at Capital International Airport Station exceeds 35°C. The Polymarket contract currently prices this outcome at 2% probability, implying traders expect a notably cooler day than the historical norm for mid-August in the Chinese capital. Settlement hinges on the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters when station equipment records micro-variations throughout the day.

August temperatures in Beijing have historically clustered in the 32–36°C range during the mid-month period, with exceedances above 35°C occurring in roughly 60–70% of years over the past two decades. The 2% pricing suggests the market is pricing in either an unusually wet monsoon pattern or a significant weather system that would suppress peak temperatures well below seasonal norms. For context, Beijing experienced a notably cool August 2023 with several days failing to breach 30°C, though such outcomes remain statistical outliers rather than the rule.

Traders monitoring this contract should track China Meteorological Administration forecasts released in early August 2026, particularly any advisories regarding Typhoon season activity or upper-level trough positioning over northern China. The timing of any tropical cyclone moisture reaching the region in mid-August would be the primary catalyst shifting probabilities materially. Additionally, urban heat island effects at the airport station can vary year-to-year depending on ground conditions and surrounding development, though this remains a secondary factor compared to synoptic weather patterns.

Methodology

We track Highest temperature in Beijing on August 15? 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 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.