Highest temperature in Shanghai on July 24?

Platform comparison

Market context

Shanghai is already in a hot, humid summer pattern, and the latest forecasts point to daytime highs in the mid-30s Celsius with showers or thunderstorms possible later in the day. AccuWeather’s July outlook shows Shanghai daily highs ranging from 86°F to 100°F, while current city forecasts cluster around 35°C with a meaningful afternoon rain risk.[1][3][11]

The market’s 0% yes price is best read against the fact that the settlement source is the *highest* temperature at Shanghai Pudong International Airport Station, not the citywide afternoon high. That makes this an intraday extremes question: even if clouds or showers arrive, the station can still print a higher one-off reading before rainfall or sea-breeze moderation sets in. July climatology for Shanghai supports that framing, with typical highs around 32°C to 35°C and frequent humidity, and historical guidance notes that July and August are the city’s hottest months, with around ten days per month at or above 35°C.[8][13][15]

For traders, the key catalysts are the timing of any morning sunshine, afternoon convective showers, and whether the airport station gets a short-lived spike before cloud cover or rain suppresses the peak. The most useful checks are the live station observations and hourly updates from the morning through early afternoon, because a settled daily maximum can be set well before the 12:00 UTC settlement window closes. Recent forecast products also show a non-trivial chance of showers and thunderstorms, which mainly matter because they can cap the top end rather than eliminate a hot opening stretch.[2][3][5][11]

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

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.

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 Prediction Today. 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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today 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.