Highest temperature in Shanghai on August 6?

Platform comparison

Market context

Polymarket prices this Shanghai temperature contract at **0% YES** today, which implies the market is currently treating a qualifying airport reading above the relevant threshold as effectively absent from the tape rather than merely unlikely. The event is straightforward in real terms: the highest temperature recorded at Shanghai Pudong International Airport on 6 August 2026, as published by Wunderground, will determine which temperature range the conditional tokens settle into on Polygon, with USDC used for on-chain exposure and payout.

The historical frame does not support an extreme outcome, but it does support a hot one. Shanghai’s August climate is typically warm to very hot, with monthly average highs around 87°F and forecast highs for early August often sitting in the upper 80s to mid-90s °F, while separate forecast providers currently show 6 August with highs around 89°F to 95°F and mixed cloud or shower risk.[1][2][7] That makes the market’s zero-price consistent with a view that the airport station may remain below a higher settlement band, even though the city’s broader summer pattern regularly produces temperatures in the low-to-mid 30s°C.[3][4][14]

For traders, the main catalysts are the evolving same-day weather model runs, the timing of any showers or thunderstorm bands, and any sea-breeze or cloud-cover shifts that cap the afternoon peak; current guidance already splits between passing showers and a hot afternoon, which matters because the settlement uses the day’s highest observed reading, not a daily average.[2][17] The relevant dependency is operational rather than narrative: the market resolves off the airport station’s Wunderground history page, so the practical watchlist is the late-morning to mid-afternoon temperature path at Pudong, plus any forecast revision from the morning into the early local afternoon.[1][2]

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

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.

FAQ

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

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.