Highest temperature in Shenzhen on July 21?

Platform comparison

Market context

Shenzhen's peak temperature on 21 July 2026 will be recorded at Bao'an International Airport Station and resolved against historical weather data from Wunderground. The market currently shows 0% implied probability across all temperature ranges, suggesting either incomplete pricing or a data-loading issue rather than genuine consensus that no temperature will be recorded. July represents the height of Shenzhen's summer monsoon season, when daily highs routinely exceed 32°C and frequently reach into the mid-to-high 30s Celsius.

Shenzhen's July temperatures have historically clustered between 32–36°C over the past two decades, with extreme readings above 37°C occurring in roughly one year per decade during particularly intense heat waves. The 2022 summer saw multiple days exceed 38°C across southern China, whilst 2020 and 2021 produced more moderate peaks in the 34–35°C range. Airport station readings typically run slightly cooler than urban core measurements due to proximity to coastal influences, though the differential rarely exceeds 1–2°C during peak afternoon hours.

Traders should monitor China Meteorological Administration seasonal forecasts and any tropical cyclone activity in the South China Sea during late June and early July 2026, as both can materially shift temperature trajectories. The settlement window closes at 12:00 UTC on 21 July, meaning the market resolves based on the full calendar day's maximum temperature rather than intraday volatility. Current zero pricing across all bands warrants verification against competing prediction markets and weather-specific platforms before positioning.

Methodology

We track Highest temperature in Shenzhen on July 21? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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 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.