Highest temperature in Beijing on July 25?

Platform comparison

Market context

Beijing's peak temperature on 25 July 2026 will be measured at Capital International Airport Station and resolved against historical weather data. The current zero probability assigned to this market reflects the settlement window closing at midday UTC, which creates a timing mismatch: the highest temperature typically occurs in mid-to-late afternoon local time (Beijing is UTC+8), meaning the full daily maximum may not be recorded before resolution. This structural constraint explains the apparent disconnect between crowd sentiment and the meteorological certainty that some temperature will be recorded.

July temperatures in Beijing historically cluster between 28–35°C, with extreme heat occasionally pushing above 37°C during particularly intense summer patterns. The 2010 heatwave saw peaks near 40°C, whilst more moderate years settle around 32–34°C. The settlement mechanism—relying on Wunderground's historical database for the airport station—has proven reliable for past events, though the noon UTC cutoff means traders are effectively betting on whether conditions will be sufficiently unusual to warrant coverage before the window closes rather than on the temperature itself.

Traders should monitor China Meteorological Administration forecasts released in early July and any heat alerts issued by Beijing authorities in the days preceding the 25th. Recent patterns show that July heat in northern China correlates with upper-level atmospheric blocking, which meteorological services typically flag 7–10 days in advance. The specific resolution dependency on airport station data (rather than city-centre measurements) also matters; airport locations often record slightly different extremes than urban sites due to surface characteristics.

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.

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.

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.