Highest temperature in Shenzhen on August 2?

Platform comparison

Market context

Shenzhen’s highest temperature on 2 August will be measured at Bao’an International Airport, and the contract resolves to whichever Celsius range contains that day’s peak reading on Wunderground. With the market showing **0% YES**, the crowd is effectively pricing an outcome at the very bottom of the listed range, which is a stark divergence from the broader climate norm for early August in Shenzhen, where average highs cluster around **32–32.5°C** and daily highs are often near **89–91°F** (about **32–33°C**).[1][3][9]

The historical frame argues against treating 0% as a neutral number. Multiple climate references put Shenzhen’s early-August daytime high in the low 30s Celsius, while some day-by-day August guides show individual dates in the mid-30s Celsius, implying that a reading in the upper bins is plausible rather than extreme.[2][4][7][16] On that basis, the prediction-market price looks notably lower than the weather profile would usually justify, especially if sportsbook-style weather lines are near the seasonal mean rather than a cold-tail outlier; no analyst consensus source in the results supports a near-zero probability for a Shenzhen heat outcome.[1][3][9]

For traders, the main catalysts are the same ones that move any airport-station temperature print: the daytime forecast evolution, cloud cover, rainfall timing, and the risk of typhoon-related disruption, which can quickly cap the daily maximum even when the broader seasonal pattern is hot and humid.[4][17] The key dependency is the official Wunderground history page for Shenzhen Bao’an International Airport, because that is the settlement source and the final value will depend on the station’s highest recorded temperature during the full day rather than a citywide average.[1]

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

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

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.

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.