Highest temperature in Chongqing on July 2?

Platform comparison

Market context

The underlying event is whether Chongqing’s Jiangbei International Airport will record a July 2nd high temperature of 30°C or more, a threshold the market currently prices at 0% YES despite the city’s notorious summer heat. This near-zero implied probability clashes with historical reality: Chongqing routinely clears 30°C in July, with daytime highs typically ranging from 32°C to 37°C and extreme cases approaching 40°C[5]. Over 17 years of recorded data, the city’s hottest day hit 43.2°C, and July averages 20.2 rain days yet still delivers scorching peaks[6]. Even in 2025, a heatwave pushed temperatures close to 39°C, though daily peaks rarely exceed that in July[4]. The consensus appears to be betting on an anomalous cool spell, but the value lies in recognising that 30°C is the underdog, not the favourite.

Traders should watch for official heatwave advisories from China’s National Meteorological Centre and real-time Wunderground updates for the Jiangbei station, as these directly determine settlement[1]. Recent reporting confirms Chongqing residents are already seeking shelter from intense heatwaves hitting the southwest, reinforcing the likelihood of extreme temperatures[4]. With July being the month of highest rain frequency yet also delivering the city’s highest average daytime highs of 28.7°C to 30.6°C, the contrarian angle is to bet YES: the market’s 0% pricing ignores the overwhelming historical tendency for July highs to exceed 30°C[2][5]. The real risk is not a cool day, but whether the heatwave intensifies further, potentially pushing temperatures toward 40°C.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Chongqing on July 2? 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 Who Will Win. 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.

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.

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.