Highest temperature in Chengdu on August 6?

Platform comparison

Market context

Chengdu has started the day with a forecast calling for **rain** and a high near **35°C**, which keeps the market in the upper half of the summer range even though cloud cover and showers can trim the realised peak. Hong Kong Observatory’s city bulletin for 6 August also points to **21–35°C** for Chengdu, while current weather services still show hot, humid conditions rather than a cool interruption.[9][13]

For this contract, the key question is not the average August climate but whether Chengdu Shuangliu International Airport reaches a spike above the low-30s before the daily heating cycle fades. August in Chengdu is normally hot, humid, and often wet, with long-run guides putting typical daytime highs around **30–32°C** and noting that the month is often the wettest of the year.[1][6][15] Those norms make a sub-30°C outcome possible only if rainfall arrives early and persists, but they also leave room for a brief surge into the mid-30s when sunshine breaks through.[4][20]

Traders should watch the morning and early afternoon forecast updates, especially any change in rain timing, since the settling source is the airport station’s *highest* temperature for the day, not the citywide average. Any easing in showers or stronger-than-expected sunshine would raise the odds of a mid-30s reading, while an earlier, more persistent rain band would tend to cap the high closer to 30–32°C. The most useful live inputs are the airport observation feed and the day’s updated municipal forecasts, because those are the factors most likely to move the final maximum before the 12:00 UTC settlement window closes.[9][13][19]

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

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 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%.