Highest temperature in Beijing on July 20?

Platform comparison

Market context

The market tracks the peak Celsius temperature recorded at Beijing Capital International Airport on 20 July 2026, a date historically prone to humid, warm summer conditions. July in Beijing typically sees temperatures between 23°C and 31°C, with the month often being one of the wettest due to average rainfall near 185 mm[1]. The current 0% crowd-implied probability for a specific outcome suggests the crowd expects the temperature to fall outside the defined range, likely anticipating a standard high within the historical band rather than an extreme outlier.

Historical July data frames this probability as a baseline expectation rather than a prediction of anomaly; comparable cases show highs rarely deviating significantly from the 23–31°C range unless a specific heatwave event occurs. A power-user approaching this programmatically would script a bot to poll Wunderground’s daily history endpoint for ZBAA at the settlement timestamp, comparing the returned value against the market’s resolution ranges. This automated verification removes manual error, ensuring the trade executes only when the live data confirms a breach of the expected threshold.

Traders should monitor the Beijing Meteorological Bureau’s weekly heatwave forecasts and any sudden shifts in the East Asian monsoon, which dictate humidity and temperature spikes. While no specific announcement has triggered the current 0% probability yet, dependencies include real-time satellite data on cloud cover and wind direction, which can suppress or amplify peak temperatures. A conditional order strategy would be optimal here, setting triggers to buy or sell only if the live Wunderground feed crosses the 31°C threshold before the 2026-07-20T12:00:00Z settlement window closes.

Sources: 1

Methodology

We track Highest temperature in Beijing on July 20? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Kalshi Fees. 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.

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 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.