Highest temperature in Shanghai on August 6?

Platform comparison

Market context

Polymarket is pricing this Shanghai airport temperature contract at **0% YES** right now, even though the market is still live and settles off the **highest reading at Shanghai Pudong International Airport Station** on 6 August, reported in Celsius by Wunderground and paid out in USDC via Polygon conditional tokens. On the current board, that implies traders are assigning effectively no chance to any listed temperature band winning at expiry, despite the fact that Shanghai is firmly in its hot season and daily highs in early August are typically in the low- to mid-30s °C. AccuWeather’s August forecast for Shanghai shows highs ranging from **82°F to 92°F** (about **28°C to 33°C**) and lows from **71°F to 81°F**[1].

For comparison, multiple forecasters are already pointing to a warm August 6 in Shanghai: timeanddate’s forecast shows **95°F / 83°F** with passing showers[2], while other seasonal guides put early-August highs around **31°C to 32°C**[7][9]. That matters because this market resolves on the *peak* temperature, not the daily average, so a brief afternoon spike is enough to move the winning band. In practical Polymarket terms, the 0% print looks detached from the usual Shanghai August range rather than a confident call that temperatures will stay below all available outcomes[16].

The main catalysts are the hourly temperature path, cloud cover, rain timing, and any late-morning to afternoon heat build-up at Pudong. Forecasts now show a hot day with showers or cloud around Shanghai, which can cap the upside if rainfall arrives early, but forecast highs still sit around the mid-30s °C on some services[2][12]. Traders watching the contract should keep an eye on updated station data and any same-day forecast revisions before the settlement window closes at 12:00 UTC, because the final print comes from the airport station’s recorded maximum rather than citywide averages[16].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 6? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Alternative UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.