Highest temperature in Beijing on August 15?

Platform comparison

Market context

Beijing's highest temperature on 15 August 2026 will be recorded at the Capital International Airport Station and measured against discrete Celsius bands. The market currently prices all outcomes at 0% YES, reflecting the settlement window's closure date coinciding with the event itself—traders cannot arbitrage real-time temperature data once the 12:00 UTC deadline passes on that date. This creates a timing constraint where conditional token holders must commit capital before the actual observation occurs, with resolution dependent on Weather Underground's Daily Observations table rather than the Day High & Low summary section.

Historical August temperatures in Beijing show considerable year-to-year variation. The city's August average high sits around 29°C, though extremes have ranged from 25°C to 41°C across recent decades. The 2010 heatwave pushed readings above 40°C, whilst cooler Augusts have seen highs in the mid-20s. This volatility explains why the market's current zero probability reflects genuine uncertainty rather than consensus forecasting—no single temperature band commands obvious dominance given Beijing's climatic range during this month.

Traders monitoring this contract should track seasonal weather pattern forecasts released by China's Meteorological Administration in the weeks preceding mid-August 2026, particularly any El Niño or La Niña signals that influence East Asian summer temperatures. Urban heat island effects at the airport station itself merit consideration, as infrastructure changes or measurement adjustments could shift baseline readings. The resolution dependency on a specific data source—Weather Underground's Daily Observations table—means verifying that station's operational status and data quality becomes critical as the settlement date approaches.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 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.

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%.