Highest temperature in Chengdu on August 14?

Platform comparison

Market context

Chengdu will experience peak summer heat on 14 August 2026, with the highest temperature recorded at Shuangliu International Airport Station determining the settlement outcome. The market resolves using Weather Underground's Daily Observations table rather than the summary Day High & Low section—a distinction that matters when automated feeds pull data from multiple sources. For programmatic traders, this means validating the specific table endpoint and accounting for potential lag between real-time station readings and Weather Underground's published historical record.

Chengdu's August temperatures have historically ranged from 32–38°C, with extreme heat events occasionally pushing toward 40°C during particularly intense heatwaves. The 2022 summer saw several days exceed 38°C across Sichuan Province, establishing a recent benchmark for what constitutes an outlier reading. Comparing this market's 0% implied probability against historical frequency data suggests traders are pricing in either a cooler-than-normal August or treating the specific settlement mechanics as sufficiently uncertain to warrant caution.

Traders should monitor China Meteorological Administration forecasts released in early August, which typically provide 10–14 day outlooks for regional temperature extremes. El Niño or La Niña phase transitions influence Sichuan summer patterns, and any official heat warnings issued by provincial authorities would signal elevated tail-risk scenarios. For conditional order strategies, setting alerts on Weather Underground's historical data feed during 13–14 August allows real-time tracking of station readings as they accumulate, reducing settlement ambiguity post-event.

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 Polymarket Bot 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%.