Highest temperature in Chongqing on August 10?

Platform comparison

Market context

Chongqing’s afternoon maximum on 10 August is the key event, and the market is being priced against a city that is normally hot, humid and capable of sharp intraday swings. AccuWeather’s current forecast points to about 95°F/35°C with thunderstorms and a RealFeel above 40°C, while broader August climatology for Chongqing usually clusters around the low-to-mid 30s Celsius, with occasional peaks well above 39°C in hotter spells.[12][8][16][11] That makes the contract’s crowd-implied 0% YES look detached from the weather profile itself: on Polymarket, the live book is concentrated in the 33–35°C band, led by 35°C at 41% and 34°C at 36%, which is much closer to the forecast and historical seasonal baseline.[3]

Comparable cases show why traders tend to treat Chongqing heat markets as range trades rather than binary bets on extremes. The city’s August climate is consistently warm enough that modest forecast misses can shift the winning bracket, but the all-time records cited in weather histories also show that very high readings are possible when heat builds under stagnant conditions.[13][11] On a cross-platform basis, the main divergence is between the market’s 0% YES framing and the sportsbook-style price action in the bracket outcomes: the contract is not signalling an expectation of a cool day, but rather uncertainty over whether the highest reading lands in the low 30s or mid 30s Celsius.[3]

The key catalysts are mundane but material: the day’s thunderstorm timing, cloud cover, and any late-afternoon convection can cap the maximum, while a clear, humid morning with delayed rain often favours the upper brackets.[12][14] Because resolution comes from the Daily Observations table at Weather Underground for Chongqing Jiangbei International Airport Station, not the summary high/low, traders should watch for the station’s hourly progression rather than the headline forecast alone.[1] A separate point of practical relevance is that the market already has a recent resolved analogue on 3 August, when Chongqing printed 24°C on the same broader theme, showing how settlement has been tied to the station record rather than citywide impressions.[20]

Sources: 1 · 2 · 3 · 4 · 5

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.

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.

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.