Highest temperature in Wuhan on August 17?

Platform comparison

Market context

Wuhan's peak temperature on 17 August 2026 will be measured at Tianhe International Airport Station and resolved against Weather Underground's Daily Observations table. The crowd currently assigns zero probability to this outcome occurring, suggesting either extreme confidence in a specific temperature range or insufficient liquidity driving the market to an edge case. August in Wuhan typically sees daily highs between 32–36°C, with occasional peaks above 37°C during heat waves, making the full distribution of plausible outcomes worth examining against the current pricing.

Historical August data from Wuhan shows considerable year-to-year variation. The city experienced a maximum of 39.4°C in August 2013 and regularly records temperatures in the 35–37°C band during mid-August. The 0% probability assigned here likely reflects the market's narrow focus on a single day's peak rather than scepticism about heat itself; traders may be clustered around adjacent temperature brackets, leaving this particular range underpriced if it represents a realistic outcome given Wuhan's seasonal patterns.

The settlement depends entirely on Weather Underground's Daily Observations data from Tianhe station, making source reliability the key dependency. Traders should monitor early-August 2026 weather patterns and any anomalies in regional atmospheric conditions, though such forecasts remain unreliable beyond two weeks. The 0% pricing suggests potential value exists if this range aligns with climatological norms for mid-August, particularly if adjacent brackets carry inflated probabilities that have crowded out this option.

Methodology

We track Highest temperature in Wuhan on August 17? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win. 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%.