Highest temperature in Chongqing on July 17?

Platform comparison

Market context

Chongqing is set to experience its peak summer heat on 17 July 2026, with the market tracking the highest temperature recorded at Jiangbei International Airport. The crowd-implied probability of a specific outcome sits at 0% YES, suggesting traders view the current line as mispriced or the event as virtually impossible under the defined conditions. This stark divergence contrasts with typical sportsbook volatility, where weather lines often shift rapidly as forecast models update, whereas prediction markets here remain static until the settlement window closes at noon UTC on 17 July.

Historically, Chongqing frequently breaches 40°C during mid-July, with the city known as one of China’s “three furnaces.” Comparable cases from 2022 and 2023 show daily highs reaching 42°C at the same station, making a 0% probability for any non-extreme range statistically anomalous against long-term climatic data. Analyst consensus on similar heat contracts usually assigns significant weight to historical baselines, yet this market’s pricing implies a unique deviation, possibly due to a specific temperature threshold in the resolution criteria that traders deem unattainable despite regional trends.

Traders should monitor the hourly forecast updates from Wunderground and the China Meteorological Administration’s 24-hour outlook released early on 17 July, as these directly dictate the settlement value. A recent report from the South China Morning Post highlights an incoming subtropical ridge expected to intensify heat across the Yangtze River basin, potentially pushing temperatures toward record levels. The key dependency is the precise timing of the peak heat relative to the station’s measurement schedule, as any cloud cover or rain event before noon UTC could invalidate the extreme range implied by the current odds.

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 UK. 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.

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.

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.