Highest temperature in Shenzhen on July 23?

Platform comparison

Market context

Polymarket has this Shenzhen airport heat contract priced at **0% YES**, even though the city is already sitting in peak-summer weather and the relevant measurement window is still open. On this market, traders are really pricing the chance that the highest temperature recorded at Shenzhen Bao'an International Airport Station on the day lands inside the chosen Celsius band, with settlement handled through Polymarket’s USDC, Polygon and conditional token mechanics rather than any judgement call on the broader local climate.

For context, July is Shenzhen’s hottest month on average, with daytime temperatures around 32°C and a warm, humid monsoon pattern that also brings frequent rain. That matters because the market is not about the daily average but the single highest reading logged by the airport station on the day, so even a modest midday surge can decide the outcome. Current conditions are already hot and humid, with Shenzhen reporting 84°F and a RealFeel of 96°F, which is consistent with a city that can still print a stronger peak before cloud, sea breeze or rainfall intervenes.[1][2]

A trader watching this contract should focus on the timing of the local heating cycle, any rainfall or thunderstorm development, and whether coastal cloud cover limits the afternoon maximum. The settlement source is Wunderground’s daily history page for Shenzhen Bao’an International Airport Station, so the decisive data point is the highest observed temperature there on the date, not a forecast headline or a citywide figure. At 7:08 UTC, the market is still exposed to late-morning and early-afternoon moves in southern China, when the day’s maximum is typically set.[1][2]

Sources: 1 · 2

Methodology

We track Highest temperature in Shenzhen on July 23? 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

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.