Highest temperature in Beijing on August 17?

Platform comparison

Market context

Beijing's maximum temperature on 17 August 2026 will be measured at the Capital International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement determined by whichever temperature range contains that single highest reading in Celsius. The market currently prices all outcome ranges at 0% on Polygon, suggesting either technical settlement issues or that traders are awaiting historical data to calibrate expectations for a date still twenty months away.

August temperatures in Beijing typically peak between 32–35°C, with occasional extremes reaching 37–38°C during heat waves. Historical records show that mid-August sits near the tail end of Beijing's summer monsoon season, when afternoon thunderstorms can suppress daily highs despite intense morning heat. The 2010 heat wave pushed readings above 40°C, but such events remain statistical outliers; most years see August 17 settle in the 30–34°C band. Current pricing at zero across all ranges reflects the absence of real-time weather forecasting data this far forward rather than any expectation of anomalous conditions.

Traders monitoring this contract should track China Meteorological Administration seasonal forecasts, typically released in late July, which may signal whether 2026's August will trend warmer or cooler than the thirty-year normal. Tropical cyclone activity in the Western Pacific during early August could redirect moisture patterns toward Beijing, potentially lowering highs through cloud cover and precipitation. Weather Underground's historical station data for Beijing Capital Airport remains the binding source; discrepancies between its Daily Observations and Day High & Low summaries have occasionally created settlement disputes on similar contracts, making source verification critical before position entry.

Methodology

We track Highest temperature in Beijing on August 17? 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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.