Highest temperature in Beijing on August 17?

Platform comparison

Market context

Beijing's highest 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 the specific temperature range containing that peak reading in degrees Celsius. The Polymarket contract currently shows 0% implied probability across all temperature brackets, suggesting either minimal trading activity or a technical issue with price discovery on this particular outcome.

August represents the tail end of Beijing's summer monsoon season, when daily highs typically range between 28–32°C, though heat waves can push readings above 35°C. Historical data from the past decade shows that mid-August temperatures in Beijing have occasionally exceeded 36°C during particularly intense heat events, most notably in 2015 when the city recorded 40.6°C. The 0% crowd probability reflects the absence of meaningful market liquidity rather than genuine certainty about temperature outcomes; comparable weather markets on Polymarket typically see active trading only when conditional token prices reflect genuine uncertainty across multiple temperature bands.

Traders monitoring this contract should track China Meteorological Administration forecasts released in early August 2026, which provide ten-day outlooks for Beijing. The distinction between Weather Underground's Daily Observations table and its Day High & Low summary section matters operationally—the former updates continuously throughout the day whilst the latter represents a final daily figure. Any significant atmospheric pressure systems moving across northern China in mid-August, particularly tropical cyclones tracking inland from the Pacific, would materially shift temperature expectations and potentially trigger trading activity on Polygon-settled USDC pairs.

Methodology

This page reviews Highest temperature in Beijing on August 17? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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 Kalshi UK. 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.

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%.