Highest temperature in Beijing on July 6?

Platform comparison

Market context

The real-world event at hand is the peak daytime temperature recorded on 6 July 2026 at the Beijing Capital International Airport Station, a metric that will determine the settlement of a weather prediction contract. While one crowd-implied probability source suggests a 0% chance for the "YES" outcome, this figure starkly diverges from the collective view on Polymarket, where traders assign a 43% probability to a 34°C reading and 36% to 33°C[1]. This meaningful gap between a zero-implied line and active odds of over 40% signals a potential mispricing that cross-platform analysts must scrutinise against historical precedents.

Historical data frames this probability with caution, as July is Beijing’s hottest month, with daily highs typically averaging 88°F (31°C) and rarely dipping below 78°F (26°C)[3]. Recent years confirm this trend, with 2023 seeing temperatures reach 40°C (104°F) in the southern suburb observatory, representing the city’s peak heat[2][5]. Furthermore, China recorded its highest number of hot days exceeding 35°C in six decades during 2023, and July 2023 was the nation’s hottest month since records began[6][7]. These comparable cases suggest that a 34°C reading is statistically plausible, rendering the 0% implied probability highly questionable.

Traders should monitor the Beijing Meteorological Bureau’s daily heatwave forecasts and the National Climate Centre’s extreme weather bulletins, which often precede significant temperature spikes. Recent reports from Reuters highlight that China has logged extreme weather events exceeding 52°C in arid regions, indicating a broader pattern of intensifying heat that could impact northern cities like Beijing[4]. Additionally, the upcoming release of the China Meteorological Administration’s mid-July climate summary will provide critical data on humidity levels and solar radiation, both key dependencies for determining if the airport station will breach the 33°C threshold on the settlement date.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

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 UK. 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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.