Highest temperature in Beijing on August 14?

Platform comparison

Market context

Beijing's peak temperature on 14 August 2026 will be measured at Capital International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement occurring at 12:00 UTC that day. The current Polymarket pricing reflects 0% probability across all temperature bands, suggesting either insufficient liquidity or genuine uncertainty about which range will contain the day's high. Traders holding conditional tokens on this contract are effectively betting against the crowd's implicit view that no single temperature band deserves meaningful odds.

Historical August temperatures in Beijing cluster consistently between 25–32°C, with extremes rarely exceeding 35°C or dropping below 22°C. The city's monsoon season peaks in July and early August, bringing afternoon thunderstorms that typically moderate afternoon highs. Data from the past decade shows 14 August specifically has averaged around 28–30°C, with only three instances of readings above 33°C. This historical pattern anchors expectations: most traders would rationally concentrate liquidity in the 28–32°C bands rather than tail outcomes.

The resolution mechanism's reliance on Weather Underground's Daily Observations table rather than the Day High & Low summary introduces a technical dependency worth monitoring. Station maintenance, sensor recalibration, or data transmission delays could theoretically affect which figure resolves the market. Beijing's weather in mid-August typically follows predictable patterns driven by the East Asian summer monsoon's retreat, though the 2026 forecast remains unavailable this far in advance. Traders should watch for any unusual atmospheric patterns or heat dome developments reported by China Meteorological Administration in the weeks preceding settlement.

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 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 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.