Pronóstico: Highest temperature in Shanghai on July 24?

Platform comparison

Market context

Polymarket is pricing this contract at **0% YES**, which means the market is treating a day with a Shanghai Pudong International Airport high in the relevant settlement range as effectively not expected. On-chain, that price reflects the cost of the **conditional tokens** settled in **USDC on Polygon**, with the payout determined by the Wunderground reading for the airport station rather than a broader Shanghai citywide figure.

For context, Shanghai in July is usually **hot, humid and rain-prone**, with typical highs around **32°C** and frequent showers, so the key question is not whether the city is warm, but whether cloud, rain or a cooler air mass trims the day’s maximum into a lower band. Recent weather forecasts for Shanghai show highs around **95–96°F (35°C)** with intermittent rain and thunderstorms, which is broadly consistent with a summer pattern capable of producing a wide spread in the daily maximum.[1][3][5] That makes the airport station reading more sensitive to timing of storms than a simple monthly average would suggest.[2][5]

A trader should watch the **24-hour forecast cycle** for Pudong, especially any shift in rain timing, thunderstorm coverage, or the peak heating window before the settlement cut-off. Any sudden change in cloud cover, coastal flow or precipitation odds could matter more than headline temperature forecasts, since the market resolves to the **highest recorded temperature** at the station on the day, not the average. Weather sites currently point to meaningful rain chances around the Shanghai area and hot daytime conditions, which are the main dependencies to track through the morning and early afternoon.[1][3]

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 Polymarket Qué Es. 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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.