Highest temperature in Chengdu on July 27?

Platform comparison

Market context

Chengdu’s airport high will be set by the day’s maximum reading at Shuangliu International Airport, and the market is currently pricing an almost impossible outcome at **0% YES**, which looks far below the climatology for late July. Chengdu is typically warm and very humid in July, with average highs around **30°C** and frequent rain, so the contract only resolves “no” if the airport’s recorded high lands outside the market’s defined temperature band. Recent consumer weather pages also point to a hot, unsettled spell, with forecast highs reaching the mid-30s Celsius in the city and several rainy days in the two-week outlook.[1][2][3]

For comparison, the current crowd view is more extreme than the broader weather baseline implied by seasonal normals, which suggests the market may be underweighting the chance of an ordinary summer high rather than a rare cold snap. In practice, prediction-market pricing on a single-day weather contract is usually driven less by monthly averages than by the short-range forecast for the airport itself, while sportsbook-style weather lines, where available, tend to cluster tightly around the forecast high rather than assign near-zero probabilities to a broad Celsius range. Traders should watch the latest Chengdu airport forecast updates, radar-driven rain timing, and any shift in cloud cover or monsoon showers, because those factors can trim daytime heating by several degrees. The settlement source is Wunderground’s Chengdu Shuangliu International Airport history page, so the final reading depends on the station’s observed maximum rather than the broader city forecast.[1][2][3]

Sources: 1 · 2 · 3 · 4

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 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 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 Best Prediction Markets 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.