Highest temperature in Shenzhen on July 20?

Platform comparison

Market context

Shenzhen’s highest temperature on 20 July 2026 at Bao’an International Airport will determine this market’s outcome, with the crowd currently pricing a YES outcome at 0%. On Polymarket, traders are using USDC on the Polygon network to buy and sell conditional tokens tied to specific temperature ranges, reflecting a near-total consensus that the day will not hit the highest bracket implied by the contract.

Historically, July in Shenzhen sees daily highs averaging 32°C, with 17 rainy days and heavy precipitation driven by the subtropical high and typhoon activity [1]. In comparable years, extreme heat spikes above 35°C are rare during July due to frequent cloud cover and rainfall, which aligns with the market’s 0% probability for the upper range. The settlement relies on Wunderground’s recorded maximum for Bao’an Station, a site known for consistent urban heat but also regular monsoon moderation.

Traders should monitor the Guangdong Meteorological Bureau’s daily typhoon and heat advisories, as an incoming tropical system could suppress temperatures sharply. A recent forecast from China Meteorological Administration notes increased cloud cover and rain expected across the Pearl River Delta this week, reducing the likelihood of record highs [1]. With the settlement window closing at 12:00 UTC on 20 July, real-time Wunderground updates will be the final arbiter, and any sudden shift in weather patterns could alter token prices before resolution.

Sources: 1

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

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 Kalshi UK. 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 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.