Highest temperature in Beijing on July 7?

Platform comparison

Market context

On 7 July 2026, the Beijing Capital International Airport Station will record its peak temperature for the day, a real-world metric that determines the outcome of this prediction market. Historical data shows July is Beijing’s hottest month, with daily highs typically hovering around 31°C (88°F), rarely dipping below 26°C or exceeding 35°C [1]. In 2023, the month’s peak reached 40°C, and in 2010, Beijing hit 42.1°C on 5 July [3][7]. Given this pattern, a 0% crowd-implied probability for any temperature range above a certain threshold appears inconsistent with past extremes, suggesting the market may be mispricing the likelihood of a heat spike.

Traders should monitor China’s national heat advisories and local meteorological bulletins, especially as July 2026 has already seen record warmth, with 3 July reaching 35.4°C (95.8°F) [5]. Recent reports confirm China experienced its hottest July since records began, with average temperatures at 23.21°C, surpassing the 2017 benchmark [2][8]. Programmatically, one would scrape Wunderground’s daily history feed for ZBAA at 12:00 UTC, then cross-reference with AQI.in’s historical peaks to validate conditional order triggers. The key catalyst is whether the current heatwave persists into early July, a dependency that could push temperatures beyond 35°C and invalidate the current 0% pricing.

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

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.

Do I need to KYC for this market?

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