Highest temperature in Shenzhen on August 3?

Platform comparison

Market context

Polymarket is pricing this Shenzhen airport temperature contract at **0% YES** right now, so the market is effectively assigning no weight to any listed Celsius band resolving as the day’s recorded high at Shenzhen Bao’an International Airport. In practice, that means the token price on Polygon is near zero and any position is settled in **USDC** through the market’s conditional-token structure if the observed Wunderground airport reading lands inside the chosen range.

August is normally Shenzhen’s hottest month, with typical highs around **31–34°C** and humid conditions that can push the apparent heat well above the air temperature. Forecast sites currently cluster around the low-to-mid 30s for 3 August, with one showing **34°C** and another **33°C**, while BBC observations already place Shenzhen near **28°C** in the early part of the day, which is consistent with a warm climb later on.[9][11][6][17] For a market framed around the *highest* reading rather than the daily average, traders usually watch whether the afternoon peak clears the low-30s bracket or gets capped by cloud, showers, or sea-breeze effects.

The main catalysts are the intraday airport observations and any shift in local storm coverage, because Shenzhen sits in the May-to-September rainy season and August often brings humid, unsettled weather rather than a clean heat spike.[20][17] Short-range forecast services currently differ on whether showers will interrupt heating, with some calling for patchy rain or light rain and others showing a sunnier, hotter day, so the path to the final maximum still matters more than the morning reading.[3][9][14] Since the market settles on the Wunderground daily history for Shenzhen Bao’an International Airport Station, the key watchpoint is the final published high before the next date’s first datapoint appears.[6]

Sources: 1 · 2 · 3 · 4 · 5

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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.