Highest temperature in Chengdu on July 17?

Platform comparison

Market context

Chengdu faces its peak summer heat on 17 July 2026, with the market betting on whether the highest temperature at Shuangliu International Airport will hit a specific threshold. The crowd currently assigns a 74% probability to the YES outcome, implying strong confidence that temperatures will reach the upper range defined in the contract. This event hinges entirely on the daily maximum recorded at the airport station, as verified by Wunderground’s historical data for that date.

Historically, mid-July in Chengdu routinely sees temperatures between 30°C and 36°C, with 2022 and 2023 both recording peaks above 35°C during similar periods. The 74% implied probability aligns closely with these precedents, suggesting the market views the threshold as achievable but not guaranteed. However, sportsbook lines on comparable weather contracts often diverge by 5–10 percentage points from prediction-market odds, reflecting differing risk appetites and liquidity structures across platforms.

Traders should monitor the China Meteorological Administration’s 5-day forecast updates released each morning, which detail cloud cover, humidity, and wind patterns that directly influence peak temperatures. A sudden shift in the subtropical high-pressure system could push temperatures beyond expectations, while unexpected rainfall would suppress the daily maximum. No major announcements are scheduled for 17 July, but real-time satellite data from the National Satellite Meteorological Centre will provide the earliest signal of any atmospheric anomalies affecting Chengdu’s heat profile.

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 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 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.