Highest temperature in Shanghai on August 8?

Platform comparison

Market context

At Shanghai Pudong International Airport, the answer will be the **single highest observed temperature** logged in Weather Underground’s **Daily Observations** table on 8 August, converted into the market’s Celsius range at settlement. That matters because the contract does not use the headline “Day High & Low” summary if the two sections diverge, so a programmatic checker should query the daily history page, extract the observation table, and treat the maximum row value as the source of truth.[1][4]

The current 0% YES price sits well below what Shanghai’s August climatology would normally suggest. Multiple historical datasets put early-August daytime highs around the low 30s Celsius, with August averages near 32–32.5°C and occasional spikes into the mid-30s or higher; recent August examples also show highs around 34–35°C, and Weather Underground’s own history page for Shanghai has already printed high temperatures in the high 80s to low 90s Fahrenheit this week, which is consistent with a warm outcome rather than a cold one.[2][6][11][13]

A trader watching this like a utility pipeline would focus on the observation cadence, not broad forecasts: the key inputs are the airport station’s live observation feed, any late-afternoon heat peak before the settlement window closes at 12:00 UTC, and whether thunderstorms or rain suppress the day’s maximum. Forecast providers currently cluster around highs in the low 30s Celsius for Shanghai in August 2026, but the market settles on the actual station reading, so the practical edge is in parsing the final daily table once the day is complete rather than leaning on forecast averages.[5][13][17]

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 Polymarket Review 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%.