Highest temperature in Shenzhen on July 20?

Platform comparison

Market context

Shenzhen is currently experiencing overcast conditions with humidity at 83%, yet the market for the highest temperature on 20 July 2026 shows a 0% implied probability for any outcome above the lowest bracket, suggesting the crowd expects a significant cooling event or data anomaly. This near-zero pricing is highly contrarian given that July in Guangdong is typically the hottest month, with recent comparable data from 12 July 2026 showing temperatures hitting 34°C with 100% certainty for the 34°C or higher bracket[2]. The consensus appears to be misreading the seasonal baseline, treating a standard summer day as an outlier, while historical patterns for the Bao'an International Airport Station consistently favour high heat during this period.

Traders should monitor the live Wunderground feed for the Bao'an station, as the settlement relies entirely on the daily maximum recorded there, and any sensor malfunction could artificially suppress the reading. While current local readings show 84°F (29°C) with a RealFeel of 95°F, this is merely the evening temperature and does not reflect the peak daytime heat expected earlier in the day[1]. The primary catalyst is the official daily release from Wunderground, which will confirm if the temperature breaches the 34°C threshold that proved certain just eight days prior[2]. Value likely sits in the higher temperature ranges, as the 0% price ignores the statistical probability of a repeat of the mid-July heatwave.

Sources: 1 · 2

Methodology

We track Highest temperature in Shenzhen on July 20? 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

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 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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.