Highest temperature in Shenzhen on August 3?

Platform comparison

Market context

Polymarket has this contract almost entirely priced out at the lower temperature bands, with the crowd assigning a **0% YES** probability today; in practice, that means USDC buyers on Polygon are paying up only if the airport station’s daily high lands in one of the listed Celsius ranges and settles through the conditional tokens. The real-world trigger is straightforward: the highest temperature recorded at Shenzhen Bao'an International Airport Station on 3 August, as captured by Wunderground’s daily history page, is the number that matters for resolution.

For context, Shenzhen’s early-August climate is usually hot, humid and rain-prone, which tends to keep daily highs in the low-30s rather than pushing into extremes. Recent forecast pages place 3 August around **33–34°C** for daytime highs, with lows near **27–28°C**, while broader August climate guides put the city’s average high around **31–32°C**. That sort of baseline means traders are really reading whether cloud cover, showers or a brief sunny spell lift the airport reading a degree or two above the mean, rather than looking for a large swing.

The main catalysts are the same ones a hands-on Polymarket user would watch in the order book: model updates, last-mile rainfall timing, and any airport-station observations that lock in the day’s maximum before the settlement window closes. BBC Weather currently shows Shenzhen at **28°C** with humid, unsettled conditions, while other short-range forecasts flag patchy rain or thundery showers, both of which can cap the afternoon peak if they arrive early enough. On Polymarket, the relevant dependency is not a citywide headline temperature but the specific station reading that Wunderground publishes, because that is what the conditional tokens will ultimately settle against.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 3? 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

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 PolyGram. 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.

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.