Highest temperature in Shenzhen on August 15?

Platform comparison

Market context

On 15 August 2026, the highest temperature recorded at Shenzhen Bao'an International Airport will fall within one of several defined ranges. The market currently shows 0% implied probability across all outcomes, suggesting either insufficient trader participation or a technical issue with odds display, as historical August temperatures in Shenzhen consistently exceed 30°C. Resolution will depend on the Daily Observations table from Weather Underground rather than summary figures, a distinction that occasionally produces different readings from the Day High & Low section.

Shenzhen's August climate is remarkably consistent. Over the past decade, daily highs have ranged between 31°C and 35°C during mid-August, with extreme readings above 36°C occurring roughly once every three to four years. The 2023 peak for mid-August reached 34.2°C; 2022 saw 33.8°C. This historical clustering suggests the market's zero probability across all ranges reflects a data or platform issue rather than genuine uncertainty about whether temperatures will fall within typical bounds.

Traders should monitor tropical cyclone activity in the South China Sea during early to mid-August 2026, as such systems occasionally suppress peak temperatures by 2–4°C through cloud cover and moisture. The China Meteorological Administration typically issues seasonal outlooks in July. Additionally, the specific Weather Underground station designation—Bao'an International Airport—matters; urban heat island effects differ measurably from readings at alternative Shenzhen monitoring sites. Confirmation of the exact resolution source before settlement is essential, given the market's explicit reliance on the Daily Observations table rather than alternative data presentations.

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

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 Best Prediction Markets. 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 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 Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.