Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Polymarket is pricing this Shenzhen airport heat contract at **0% YES** today, so the market is effectively saying the highest temperature at Shenzhen Bao’an International Airport on 31 July is not expected to fall into the YES range. The position is settled in USDC on Polygon through conditional tokens, with the outcome determined by the day’s peak reading at the airport station rather than a citywide average or a forecast headline.

That zero bid sits against a July climate profile that is normally hot enough to leave room for a wide range of daily maxima. Shenzhen’s July average high is around 31°C, and comparable history shows late-July highs often landing in the low- to mid-30s, with the station’s broader record profile including highs well above that level.[2][18][1] For traders reading the contract hands-on, the key point is that a 0% price does not mean the event is impossible; it means the market is assigning no material probability to the specific temperature band once the airport’s final daily maximum is taken from the resolution source.[8][16]

The main catalyst is the actual weather sequence around midday and the early afternoon, when the day’s maximum is usually set. Shenzhen in late July is also in the part of the year most exposed to summer rain, humidity, and convective cloud cover, so a passing shower or thunderstorm can cap the high even on a broadly warm day.[2][15] Traders should watch the latest airport-area forecast, any storm warnings, and whether the Wunderground history page records a late spike after the market’s settlement window closes at 12:00 UTC, because the contract resolves on the station’s highest observed temperature for the full day, not on a midday snapshot.[8][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on July 31? 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.

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

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.