Highest temperature in Beijing on July 7?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Beijing Capital International Airport on 7 July 2026, measured in degrees Celsius. Polymarket prices this contract today with a 0% implied probability for the YES outcome, suggesting the crowd believes the temperature will fall outside the specified range. This near-zero pricing is stark when weighed against historical July data for Beijing, where daily highs typically hover around 31°C (88°F), rarely dipping below 26°C or exceeding 36°C [1]. Recent years have seen extreme spikes, including a 40°C peak in July 2023 [3] and a national record for July 2024 averaging 23.21°C, the hottest month in recent history [2]. Even Beijing’s all-time high of 41.9°C occurred in late July 1999, indicating that mid-July heatwaves are not anomalous [6].

Traders should monitor the China Meteorological Administration’s daily forecasts and any official heatwave advisories issued for the capital, as these often precede temperature surges. A recent Reuters report highlighted China’s record-breaking July temperatures, undersciding the trend of intensifying summer heat [2]. On-chain mechanics mean the market resolves via conditional tokens on Polygon, settled in USDC, so liquidity and slippage will shift as news breaks. The settlement window closes at 12:00 UTC on 7 July 2026, with Wunderground providing the official temperature data [3]. Watch for updates on humidity levels, as high moisture can amplify perceived and recorded heat, potentially pushing temperatures into the target range despite the current 0% crowd-implied probability.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 PolyGram 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.