Highest temperature in Shenzhen on August 8?

Platform comparison

Market context

Shenzhen has started the day hot, with Weather Underground showing 96°F/84°F at 5:39 a.m. CST and AccuWeather already printing 86°F at 8:21–8:23 a.m., alongside a forecast peak of 97°F and a midday-to-afternoon window that rises to 95–97°F. That keeps the market’s 0% implied yes probability anchored to an ordinary, but still very warm, early-August setup rather than an outlier heat event[10][2][3].

For context, Shenzhen’s August climate is normally hot and humid, with recent forecast pages placing daily highs in the low-to-mid 30s °C and August averages around 32°C, so a reading near 36°C is not exceptional for the city even if it is uncomfortable for residents[1][8][13][17]. The key point for this contract is that it settles off the highest temperature in Weather Underground’s Daily Observations table for Shenzhen Bao'an International Airport, so traders should focus on the station’s realised peak rather than the broader city forecast or a summary high printed elsewhere[10].

The main intraday catalysts are the timing of the hottest part of the day, cloud build-up, and any afternoon thunderstorms, which AccuWeather already flags as possible later on Saturday. If the airport station tracks the wider city forecast, the decisive observation is likely to come between late morning and mid-afternoon, but a brief convective shower or sea-breeze shift could cap the final maximum below the headline forecast. Weather Underground’s current page indicates the station report was only recently refreshed, so the settlement-relevant number can still move if a later observation posts a higher peak before the window closes[2][10].

Sources: 1 · 2 · 3 · 4 · 5

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

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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.