Highest temperature in Shenzhen on August 21?

Platform comparison

Market context

Shenzhen's weather on 21 August 2026 will be shaped by the tail end of China's summer monsoon season, when the city typically experiences peak heat and humidity. August temperatures at Shenzhen Bao'an International Airport have historically ranged between 32–35°C as daily highs, with occasional spikes above 36°C during particularly intense heat waves. The 0% crowd probability suggests traders are either uncertain about the specific temperature bands available or treating this as a placeholder until closer to the settlement date.

Historical August data from the airport station shows that extreme heat events—temperatures exceeding 37°C—occur roughly once every three to five years in Shenzhen. The city's coastal location and urban heat island effect create conditions where afternoon peaks can climb sharply, particularly when tropical systems stall or high-pressure systems dominate the region. Comparable years with similar atmospheric patterns (2015, 2019) recorded highs between 34–36°C during mid-August.

Traders should monitor tropical cyclone activity in the Western Pacific during early-to-mid August 2026, as storm systems can either suppress temperatures through cloud cover and rainfall or intensify heat through pre-storm atmospheric compression. The China Meteorological Administration typically issues seasonal forecasts in late July that provide directional guidance on monsoon intensity. Resolution will depend on the specific reading from Weather Underground's Daily Observations table at Bao'an station, not summary figures, making instrument calibration and station consistency relevant factors for settlement accuracy.

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%.