Highest temperature in Beijing on July 4?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Beijing Capital International Airport on 4 July 2026, with historical climatology showing July averages near 31–32°C and weak synoptic forcing occasionally pushing readings 2–4°C higher[1]. While the current crowd-implied probability for a "YES" outcome sits at 0%, the market frontrunner is 35°C at 25%, with 34°C trailing at 23%, suggesting the contract prices a significant chance of extreme heat despite the low initial "YES" signal[1]. Comparable cases frame this reading: in 2023, Beijing reached 40°C in July, and the city previously logged 41.1°C in June, proving that temperatures well above the average are not anomalies but documented realities in recent years[4][5].

Traders should monitor the National Climate Center’s upcoming heatwave advisories and the progression of the East Asian monsoon, as these are the primary catalysts for sudden temperature spikes. Recent reporting confirms Beijing is bracing for blistering heatwaves as they return, with officials warning of record-breaking conditions that could push temperatures beyond 40°C again[5]. On-chain mechanics on Polymarket utilise USDC on the Polygon network, where conditional tokens allow precise exposure to these temperature ranges; the settlement window ends 2026-07-04T12:00:00Z, meaning liquidity will shift rapidly once Wunderground data confirms the day’s peak[1]. The thin volume currently observed in the market may amplify price volatility if a heatwave announcement is made, so watching the official weather schedules is essential for timing entry or exit.

Sources: 1 · 2 · 3 · 4 · 5

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

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 Polymarket Legit?. 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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Legit? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.