Highest temperature in Shenzhen on August 12?

Platform comparison

Market context

On 12 August 2026, Shenzhen will record its daily high temperature, with settlement determined by the most granular reading available from Bao'an International Airport's meteorological station rather than rounded summary figures. The crowd currently assigns zero probability to any outcome, suggesting either incomplete market formation or uncertainty about which temperature band will materialise.

Shenzhen's August climate sits firmly within its hottest season, with historical August averages clustering between 32–34°C at the airport station. The city experiences tropical monsoon conditions during this period, with afternoon highs regularly exceeding 35°C and occasional peaks above 37°C during heat waves. The 2023 and 2024 August records show consistent patterns: most days settle in the 33–36°C range, though extreme heat episodes push readings toward 38–39°C. The zero-probability reading suggests traders may be awaiting clearer market structure or waiting for seasonal forecasts to crystallise before committing positions.

The South China summer monsoon patterns and any tropical cyclone activity in the western Pacific will shape August conditions. Current meteorological models for mid-2026 remain preliminary, though seasonal outlooks typically become more reliable from June onwards. Weather Underground's Daily Observations table—the specified resolution source—records sub-hourly readings, meaning the highest temperature may differ from casual weather summaries. Traders should monitor June and July 2026 forecast updates from the China Meteorological Administration and track any tropical systems that might suppress or elevate temperatures during the settlement window.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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%.