Highest temperature in Beijing on July 9?

Platform comparison

Market context

On 9 July 2026, the Beijing Capital International Airport Station will record its peak temperature for the day, a real-world event that determines the outcome of a prediction market where the crowd currently assigns zero per cent probability to any temperature above the lowest bracket. This stark divergence between sportsbook lines—where 32°C and 33°C carry meaningful odds—and the prediction market’s implied probability suggests a mispricing that traders must scrutinise before the settlement window closes in 2026.

Historical data frames this zero probability as highly questionable, given that Beijing’s all-time high of 41.9°C occurred on 24 July 1999, while early July days regularly exceed 34°C, with 2009 recording 36°C on 7 July[1][7]. Recent years show escalating heat, including 40°C in 2023 and China’s hottest month on record in July 2024, indicating that a 32°C threshold is not an outlier but a plausible baseline for mid-summer conditions[4][6].

Traders should monitor the National Meteorological Centre’s daily heatwave advisories and the upcoming week’s forecast, which predicts temperatures dropping to 34°C before rising again later next week, a pattern that could push peak readings higher[1]. The dependency on Wunderground’s official daily record, combined with rising humidity levels typical of July, means that even modest increases in ambient temperature could breach the 32°C line, making the current zero probability a significant analytical error worth capitalising on[2].

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 PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram. 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'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.

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.