Highest temperature in Wuhan on August 17?

Platform comparison

Market context

Wuhan's August weather patterns show consistent extreme heat, with daily highs regularly exceeding 35°C during mid-August. The city experiences peak summer temperatures in this period, driven by subtropical monsoon influence and urban heat island effects. Historical data from Wuhan Tianhe International Airport indicates that 17 August typically falls within the hottest fortnight of the year, with recorded highs frequently reaching 36–38°C. The 0% crowd probability suggests traders are either awaiting updated forecast data or treating this as a calibration exercise given the settlement window extends to August 2026.

Comparative analysis of past August 17th observations at Wuhan Tianhe shows temperature ranges have clustered between 34–37°C over recent decades, with occasional excursions toward 38°C during particularly intense heat waves. The absence of any meaningful probability allocation indicates either insufficient market liquidity or genuine uncertainty about which specific temperature bracket will resolve. Traders should monitor China Meteorological Administration forecasts released in early August 2026, which typically provide reliable 10–14 day outlooks for regional temperature extremes. Any significant atmospheric patterns—tropical cyclone activity, upper-level ridge positioning, or monsoon fluctuations—could shift expected highs materially. The resolution methodology specifies Weather Underground's Daily Observations table rather than summary figures, which occasionally diverge by 0.5–1°C depending on measurement timing.

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

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 Prediction Today. 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%.