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 recorded at Tianhe International Airport determining the settlement outcome. The market currently prices this contract at 0% YES across all temperature bands, reflecting the settlement window's closure date of 12:00 UTC on that day—a timing constraint that eliminates any meaningful probability mass until the actual observation occurs. Traders holding conditional tokens on Polygon will need Weather Underground's Daily Observations table, not the Day High & Low summary, to confirm resolution; this distinction matters because automated weather stations sometimes report differing figures across their platforms.

Wuhan's August climatology provides the baseline for calibration. Historical data from the past decade shows peak temperatures on mid-August dates ranging between 34–38°C, with 2013 recording 40.3°C during an exceptional heat event. The city's subtropical monsoon climate typically produces consistent high-temperature patterns in this window, though tropical cyclone activity can occasionally suppress readings. Current long-range forecasts from Chinese meteorological services remain preliminary for August 2026, but seasonal models suggest near-normal conditions rather than extreme anomalies.

The critical catalyst is China's National Meteorological Centre's official forecast release, typically issued 10–14 days before the settlement date. Any significant weather system—tropical cyclones tracking toward central China or unusual high-pressure systems—would shift market pricing materially. Traders should monitor the Wuhan Meteorological Bureau's public statements and cross-reference against Weather Underground's historical station data to establish realistic temperature bands before settlement approaches.

Methodology

This page reviews Highest temperature in Wuhan on August 17? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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

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.

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%.