Highest temperature in Wuhan on August 17?

Platform comparison

Market context

Wuhan will experience peak summer heat on 17 August 2026, with the highest temperature reading at Tianhe International Airport Station determining settlement. The market currently prices all temperature ranges at 0% YES, reflecting the settlement window closing at midday UTC on that date—a constraint that excludes afternoon peak temperatures typically recorded between 14:00 and 16:00 local time. Traders holding conditional tokens on Polygon are effectively betting against the airport station recording temperatures within their selected range before the market locks, with USDC collateral backing each position.

Historical August temperatures at Wuhan Tianhe show consistent patterns: the station recorded 39.4°C on 10 August 2023, 38.9°C on 3 August 2022, and regularly logs daily highs between 36–39°C throughout mid-August. The 0% pricing reflects the technical barrier of the noon UTC cutoff rather than climatological implausibility. August 17 typically falls within Wuhan's hottest fortnight, when subtropical high-pressure systems dominate central China and afternoon readings routinely exceed 37°C.

The settlement mechanism depends entirely on Weather Underground's Daily Observations table at Wuhan Tianhe—not the Day High & Low summary section, which occasionally diverges from granular station data. Traders should monitor China Meteorological Administration forecasts and any equipment maintenance notices at the airport station that might affect data recording. Recent patterns suggest the 35–37°C and 37–39°C ranges carry substantive probability, though the noon UTC window eliminates exposure to typical afternoon peaks.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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%.