Highest temperature in Shenzhen on July 25?

Platform comparison

Market context

Shenzhen's peak temperature on 25 July 2026 will be recorded at Bao'an International Airport Station and resolved against historical weather data from Wunderground. July sits firmly within Shenzhen's summer monsoon season, when daily highs typically range between 32–35°C, though extreme heat events can push readings above 37°C. The settlement mechanism ties directly to a single automated data point—the highest temperature logged across all 24 hours on that specific date—making this a straightforward instrumental measurement rather than a forecast-dependent outcome.

Historical precedent suggests the 0% crowd probability reflects either market illiquidity or temporal distance from the event. Shenzhen's July temperatures have remained relatively stable year-on-year, with extreme outliers (38°C+) occurring in roughly 15–20% of summers over the past two decades. For programmatic traders, the key dependency is Wunderground's data availability and methodology; the platform's historical records for Bao'an Station are consistently updated and publicly accessible, reducing settlement ambiguity. Traders building conditional orders should note that tropical cyclone activity in late July occasionally suppresses peak temperatures by 2–4°C through cloud cover and precipitation, though such systems typically occur earlier in the monsoon cycle.

The market's current state suggests limited participant engagement rather than genuine conviction toward lower temperatures. Traders evaluating this as a utility tool should consider whether the settlement window's 18-month lead time justifies position sizing, and whether Wunderground's API accessibility supports automated monitoring strategies for similar weather markets across other Asian hubs.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Polymarket Review 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.

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.