Highest temperature in Wuhan on August 17?

Platform comparison

Market context

Wuhan's daily maximum temperature on 17 August 2026 will be measured at Tianhe International Airport Station and recorded in Weather Underground's Daily Observations table. The settlement window closes at midday UTC on that date, requiring resolution data to be finalised by then. Current crowd pricing reflects near-zero conviction that the high will fall into any single temperature bracket, suggesting either extreme uncertainty about the specific range boundaries or insufficient historical calibration against Wuhan's August climate patterns.

Mid-August in Wuhan typically sees daily highs between 32–36°C, with occasional peaks above 37°C during heat waves. Historical August data from the airport station shows that temperatures exceeding 38°C occur roughly once every three to five years during the month, whilst readings below 30°C are rare. The 0% implied probability across all ranges signals either a market liquidity issue or misalignment between the crowd's baseline expectations and the actual distribution of plausible outcomes. Traders should cross-reference Wunderground's historical daily maxima for Wuhan against comparable August periods to establish which temperature brackets carry genuine tail risk.

Monitoring will depend on real-time weather forecasts released in the weeks preceding mid-August 2026, particularly from China Meteorological Administration updates and international models tracking upper-air patterns over central China. Any significant heat dome or monsoon disruption affecting the Yangtze River region could shift outcomes materially. Settlement hinges entirely on the Daily Observations extraction from Wunderground; discrepancies with the Day High & Low summary section will be resolved in favour of the former, so traders should verify the exact data source once the date arrives.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.