Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Polymarket prices this Shenzhen airport temperature contract at **0% YES** today, so the market is effectively saying there is no bid for the highest reading at Shenzhen Bao'an International Airport Station landing in the targeted Celsius band on 31 July. Because settlement uses the daily high from Wunderground for that station, traders are really positioning around a single published airport observation rather than the broader city weather. The contract is cash-settled in USDC on Polygon through conditional tokens, so any move in price comes from trading against that exact resolution source, not from personal views on “how hot Shenzhen feels”.

The historical frame is straightforward: Shenzhen is normally hot and humid in late July, with typical highs around 31–32°C and frequent rain, which can suppress the day’s maximum even when the air mass is warm. Forecast services and climate summaries place late-July highs in roughly the 89–93°F range, or about 32–34°C, while noting that July is one of the wettest months and showers or thunderstorms are common. That matters for reading the 0% print: it is not a statement that a warm outcome is impossible, but that the market currently assigns negligible weight to the relevant temperature band at the airport site.

For traders, the main catalysts are the hourly evolution of Shenzhen forecasts, whether convection builds during the local afternoon, and whether cloud cover or rain limits insolation before the observation window closes. Shenzhen’s official weather feeds and airport-adjacent forecasts are the practical dependencies to watch, alongside any tropical disturbance in the South China Sea that could alter wind, rain, and peak temperature. At 7am UTC, the market is still sitting well before the hottest local hours, so later updates in local afternoon conditions are likely to matter more than the early-morning reading.

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

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.