Highest temperature in Chengdu on July 23?

Platform comparison

Market context

Chengdu’s peak temperature on 23 July will be set by the highest reading at Chengdu Shuangliu International Airport Station, with the market resolving to the temperature band containing that day’s maximum. On the prediction market, the current leader is **38°C** at **44%**, while **39°C** is next at **22%**, which implies the crowd is leaning towards a hot but not extreme afternoon, with some probability still attached to a hotter outcome.[1]

That pricing sits in a familiar late-July Chengdu pattern: summer in the city is typically warm, humid and influenced by the rainy season, so traders are not just watching the headline temperature but also whether cloud cover or showers suppress the daily high. Comparable summer setups in Chengdu often produce a narrow spread between adjacent temperature buckets rather than a decisive move into the very hottest bins, so the current 38°C favourite looks consistent with a market expecting heat, but not necessarily a breakout above the most crowded range.[2]

For catalysts, the main dependencies are the local forecast updates, the timing of any rainfall or thunderstorms, and the behaviour of the airport station’s afternoon high, since the contract settles on the maximum recorded value rather than a forecasted official high. In practical terms, sportsbook-style lines are usually absent for this sort of weather contract, so the useful comparison is between the exchange price and analyst weather expectations; the market’s 44% on 38°C signals a modest consensus rather than a strong conviction, leaving room for a late shift if morning cloud or storm risk changes.[1][2]

Sources: 1 · 2

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 Best Prediction Markets. 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.

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.