Highest temperature in Chengdu on August 17?

Platform comparison

Market context

Chengdu's August weather pattern is entering its peak heat phase, with daily maxima typically ranging from 32–35°C during mid-month. The city's subtropical climate, influenced by monsoon systems and its inland basin geography, creates consistently warm conditions through summer, though occasional cloud cover and afternoon thunderstorms can moderate afternoon peaks. Current meteorological models for 17 August 2026 remain uncertain at this distance, but historical data shows that temperatures exceeding 36°C occur in roughly 15–20% of August days in Chengdu, whilst readings above 38°C are considerably rarer.

The 0% crowd probability reflects the market's current inability to forecast with confidence at a two-year horizon. Comparable August days at Chengdu Shuangliu International Airport—the designated measurement station—show that extreme heat events (39°C+) cluster around early-to-mid August in years with strong high-pressure systems, though such occurrences remain infrequent. The settlement mechanism's reliance on Weather Underground's Daily Observations table rather than summary figures introduces a technical dependency worth noting, as station-level data can occasionally diverge from rounded reporting.

Traders should monitor seasonal climate forecasts released by China's National Meteorological Centre in the months preceding August 2026, particularly any signals regarding El Niño or La Niña conditions, which influence East Asian summer temperatures. Tropical cyclone activity in the Western Pacific during July–August can also suppress temperatures across central China through increased cloud cover and precipitation. Real-time weather data from Shuangliu Airport will become actionable only in the final week before settlement.

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%.