Highest temperature in Chengdu on July 23?

Platform comparison

Market context

Chengdu’s official airport reading will be settled on the day’s **highest recorded temperature** at Chengdu Shuangliu International Airport, so the key question is whether the afternoon can still lift the maximum into the contract’s active range. With the crowd currently marking this at **0% YES**, the market is effectively pricing in an outcome it sees as outside the listed bands, which is a strong signal only if the temperature has already peaked; otherwise, the line can be very sensitive to a late-day warm-up, especially under clear-sky or weak-wind conditions.

For context, Chengdu’s summer highs are often determined by the strength of afternoon heating rather than the morning starting point, so historical comparison matters more than the opening reading. In weather markets like this, the biggest divergence usually comes when prediction-market pricing lags fresh forecast updates or when sportsbook-style temperature bands are keyed to a different station, a different cut-off, or a broader city forecast rather than the airport observation. If other venues are offering a similar contract, the useful comparison is whether they still leave meaningful probability on the upper tail while the crowd here has pushed to zero.

The main catalysts are the same ones that move the day’s maximum: the latest local forecast, cloud cover, rainfall timing, and any convective development that could cap heating earlier than expected. Traders should watch the hourly forecast path from Chinese and international weather services, plus any late advisories on showers or thunderstorms that would reduce the chance of a late maximum. Because settlement uses Wunderground’s airport history page, the only number that matters is the single highest observed value at that station before the 12:00 UTC settlement window closes.

Methodology

We track Highest temperature in Chengdu on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 UK. 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.

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.

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.