Highest temperature in Shenzhen on August 19?

Platform comparison

Market context

On 19 August 2026, the highest temperature recorded at Shenzhen Bao'an International Airport will fall within one of several defined ranges. A YES share in any given temperature band represents a bet that the day's peak will land in that specific bracket; a NO share is the inverse. The market uses Weather Underground's Daily Observations table as its authoritative source, prioritising that dataset over the summary figures displayed elsewhere on the platform. This distinction matters because observation-level data can occasionally diverge from rounded daily highs, particularly during periods of rapid temperature fluctuation or instrument recalibration.

Shenzhen's August climate is characterised by high heat and humidity, with historical August averages clustering around 28–32°C at the airport station. The 0% crowd probability assigned to the current market suggests traders are either awaiting resolution or reflecting genuine uncertainty about which temperature band will ultimately contain the day's high. August 2026 falls within the typical South China summer monsoon season, when daily maxima routinely exceed 30°C, though occasional tropical systems can suppress temperatures or introduce volatility. Historical precedent from recent Augusts indicates that readings between 30–34°C dominate the distribution, with extremes above 35°C occurring less frequently but remaining plausible during high-pressure systems.

The key dependency is real-time weather pattern development in the weeks preceding mid-August 2026. Tropical cyclone activity in the Western Pacific, monsoon intensity, and upper-atmospheric pressure configurations will determine whether the month experiences typical heat or anomalous conditions. Traders should monitor meteorological forecasts from the China Meteorological Administration and regional typhoon tracking systems as August approaches, since even a weak tropical system passing within 500 kilometres can suppress daily highs by several degrees.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Market UK. 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%.