Pronóstico: Highest temperature in Beijing on July 21?

Platform comparison

Market context

Beijing's highest temperature on 21 July 2026 will be measured at Capital International Airport Station and resolved against historical records via Wunderground. The market currently prices all temperature ranges at 0% on Polygon, suggesting either incomplete liquidity or a settlement mechanism awaiting activation. Traders holding conditional tokens here are betting on which bracket—likely spanning 25–40°C bands—will capture the day's peak reading in Celsius.

July represents Beijing's warmest month climatologically, with historical highs frequently exceeding 35°C. Data from the past decade shows 21 July specifically has recorded temperatures between 32–37°C, with 2010 reaching 40.6°C during an exceptional heatwave. The current 0% probability across all ranges reflects either a technical lag in market initialisation or extremely thin order books; comparable weather markets on Polymarket typically show distributed probabilities weighted toward historical seasonal norms once trading begins in earnest.

Climate patterns and urban heat island effects will shape outcomes, though no major weather forecasts extend reliably to July 2026. Traders should monitor spring 2026 temperature trends and any El Niño or La Niña developments that might influence Northern China's summer conditions. The Wunderground resolution source is straightforward and publicly accessible, eliminating ambiguity around settlement data—the primary risk remains whether sufficient USDC liquidity materialises to make position entry and exit practical before the 12:00 UTC settlement window closes on the day itself.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Qué Es. 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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Qué Es 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.