Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Polymarket is pricing this Shenzhen airport temperature contract at **0% YES** right now, so the market is treating a qualifying late-July heat spike as effectively off the table. The event itself is straightforward: the market resolves to the highest temperature recorded at Shenzhen Bao’an International Airport on 31 July, with settlement tied to the Wunderground history page for ZGSZ, and the position is held as conditional tokens on Polygon using USDC.

For context, Shenzhen’s late-July climate is normally hot and humid, with average highs around 31°C and lows in the mid-to-high 20s, but the city’s all-time record high is only 36.4°C, set in 2022.[1][2] That makes the contract sensitive to whether temperatures merely reach the low 30s, or whether a stronger-than-usual inland heat build-up pushes the airport station into the mid-30s. The crowd’s zero price suggests traders see the settlement bands above the current seasonal norm as very unlikely, even though July is one of the warmest months of the year.[1][2]

A trader watching this market will mainly be following the day’s observed maximum at the airport station rather than broader city forecasts, because settlement depends on the recorded peak on the Wunderground history page, not a forecast headline.[8][16] The key catalyst is the local weather pattern through the afternoon: sunshine, cloud cover, sea breeze effects, and any rain or thunderstorm activity can cap the high quickly in coastal Guangdong. In practice, there are no policy or schedule dependencies here; the market moves on the realised temperature print, so the relevant check is whether the station’s maximum has already been set before the settlement window closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shenzhen on July 31? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

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

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