Highest temperature in Beijing on July 6?

Platform comparison

Market context

On 6 July, the southern suburb observatory in Beijing recorded a peak temperature of 40.1°C, a figure that starkly contradicts the current crowd-implied probability of 0% for any temperature above 32°C in the prediction market for the same date. This market, which resolves based on data from the Beijing Capital International Airport Station via Wunderground, appears to be mispricing the likelihood of extreme heat, given that historical July highs in Beijing routinely reach 31–32°C and frequently exceed 35°C.

Historical patterns frame this mispricing clearly: July is Beijing’s hottest month, with average daily highs around 31°C (88°F) and peaks rarely falling below 26°C (78°F) or exceeding 36°C (96°F)[3]. In 2023, the city hit 40°C, and recent years have seen an average of 4.1 days exceeding 35°C, the highest since 1961[4][5]. The divergence between this reality and the 0% market probability suggests a significant gap compared to analyst consensus, which typically anticipates temperatures well above 32°C for early July in northern China.

Traders should monitor real-time weather updates from Wunderground and any official heatwave advisories from Chinese meteorological authorities, as these are the primary catalysts for resolution. Recent reports confirm Beijing is bracing for blistering heatwaves, with temperatures soaring above 41°C in June 2023, indicating a strong seasonal trend toward extreme heat[7]. The settlement window ends on 6 July 2026 at 12:00 UTC, and any delay in data publication from Wunderground could impact the final resolution, making timely verification essential for accurate cross-platform odds comparison.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on July 6? 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 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 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.