Highest temperature in Beijing on July 28?

Platform comparison

Market context

Beijing's highest temperature on 28 July 2026 will be measured at the Capital International Airport Station and reported in Celsius. July is consistently the warmest month in Beijing's annual cycle, with historical highs regularly exceeding 35°C during the peak summer period. The 0% crowd-implied probability suggests traders are pricing in an expectation that the settlement range will not capture the actual recorded high, or that no resolution will occur as specified.

Historical data from Beijing's meteorological records shows July daily maxima typically range between 32°C and 37°C, with occasional excursions above 38°C during heat waves. The 2010 heat wave saw temperatures reach 40.6°C in mid-July, whilst more recent summers have produced peaks in the 35–37°C band. Current probability clustering at zero indicates either extreme confidence in a specific temperature band outside the current market's range, or minimal trading activity establishing a baseline price. Without comparable sportsbook lines or published meteorological forecasts for July 2026, the divergence between the crowd estimate and historical volatility remains difficult to quantify precisely.

Traders monitoring this contract should track seasonal weather pattern forecasts released by China's National Meteorological Centre in the months preceding July 2026, as well as any El Niño or La Niña developments that influence East Asian summer temperatures. Urban heat island effects around Beijing's airport zone may also shift expectations relative to broader city measurements. The Wunderground historical database will be the sole arbiter of settlement, making data availability and station calibration relevant considerations for position management.

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.