Highest temperature in Shenzhen on August 8?

Platform comparison

Market context

Polymarket has this contract at **0% YES** right now, so the on-chain price on Polygon implies essentially no expectation of Shenzhen’s airport station hitting the relevant Celsius band on 8 August. Because settlement uses **USDC** and the final outcome is determined from **conditional tokens**, the trade is really a view on whether the daily maximum in Weather Underground’s *Daily Observations* table at Shenzhen Bao’an International Airport lands in the target range, not on a broad “hot day” headline.

The benchmark matters because Shenzhen is typically hot in August, but the market resolves to the *observed* station maximum rather than the more eye-catching forecast high. Recent weather pages have shown highs in the mid-30s Celsius for the city, while Weather Underground’s Shenzhen page has already been showing very warm pre-market conditions and a forecast near 96°F/84°F with a “nearly the same as yesterday” note, which is consistent with a high-heat regime but does not by itself settle the market.[10][14][15] Comparable summer weather in Shenzhen often features high humidity, afternoon convection and occasional thunderstorms, so the exact peak depends on whether heating before showers is strong enough to push the station reading into the settlement band.[14][19]

A trader should watch the Weather Underground station page through the settlement window, especially the timestamped **Daily Observations** entries and any late-afternoon spike before cloud cover or rain cools the airport.[10] The practical catalyst is not an official announcement but the sequence of hourly conditions: if the observed maximum stalls below the target band, the market stays dead; if the airport reaches a hotter reading before precipitation arrives, the probability can move quickly even if public forecasts remain unchanged.[2][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shenzhen on August 8? 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 Polymarket Scam?, 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.