Highest temperature in Shenzhen on August 18?

Platform comparison

Market context

On 18 August 2026, the highest temperature recorded at Shenzhen Bao'an International Airport will fall into one of several defined ranges, measured in degrees Celsius and sourced from Weather Underground's Daily Observations table rather than summary figures. The market currently prices all temperature outcomes at 0% YES across the board, reflecting either incomplete market initialisation or a technical issue in how conditional tokens have been distributed on Polygon. This pricing anomaly means traders face an unusual arbitrage opportunity: one range must resolve YES, yet none currently holds measurable probability mass in USDC-denominated conditional tokens.

Shenzhen's August climate is remarkably consistent. Historical data from the past decade shows daily highs clustering between 32–35°C during mid-August, with extreme readings above 36°C occurring in roughly 15–20% of years. The 2023 and 2024 August records for the airport station showed peaks of 34.2°C and 33.8°C respectively, establishing a baseline against which the 2026 outcome should be evaluated. Tropical systems occasionally push temperatures higher, though direct typhoon impacts remain relatively rare during this specific window.

The relevant catalyst is the Western Pacific typhoon season, which peaks in August. The Japan Meteorological Agency and China Meteorological Administration issue seasonal forecasts in July; any significant storm system tracking toward the Pearl River Delta in mid-August would shift probability toward higher temperature ranges. Additionally, urban heat island effects at the airport station can amplify readings on clear, windless days. Traders should monitor weather models from 15 August onwards, as the five-day forecast window will clarify whether tropical moisture or high-pressure systems dominate the settlement date.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Alternative UK, which mirrors the Polymarket order book directly.

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%.