Highest temperature in Beijing on June 30?

Platform comparison

Market context

Beijing is currently experiencing a severe heatwave, with temperatures soaring past 41 degrees Celsius, a level that has shattered June records and marked the hottest day in over 60 years. This real-world event directly informs the market on the highest temperature at the Beijing Capital International Airport Station, where the crowd-implied probability of a specific range sits at zero per cent, suggesting traders are betting against that outcome or hedging for a different range entirely.

Historical data frames this probability starkly: in June 2023, the city recorded 41.1C, the second-highest temperature in its history, while average daily highs in June typically range from 84F to 87F, rarely exceeding 96F [1][2][3]. The recent Reuters report confirms that heatwaves have returned to northern China, pushing the mercury to record levels that make a 41C+ outcome highly plausible, yet the zero per cent probability implies the market may be pricing in a lower threshold or a specific temperature band that excludes this extreme [1].

A power-user evaluating this tooling programmatically would monitor the Wunderground feed for the Beijing Capital International Airport Station, setting conditional orders to trigger if the hourly temperature breaches 40C, as the settlement window ends precisely at 12:00 UTC on 30 June 2026 [7]. Traders should watch for official announcements from Chinese weather authorities regarding the duration of the current heatwave, as the recent BBC report highlights that such extreme conditions are often short-lived but intense, creating volatility in the final hours before settlement [2]. The dependency on the specific station’s data rather than the city centre measurement point is critical, as the airport station may record slightly different peaks than the southern suburbs station cited in the 2023 record [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Beijing on June 30? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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.