Highest temperature in Beijing on July 21?

Platform comparison

Market context

Beijing's maximum temperature on 21 July 2026 will be recorded at the Capital International Airport Station and settled against historical data from Weather Underground. July is consistently the warmest month in Beijing, with average highs around 29–30°C, though peak temperatures frequently exceed 35°C during heat waves. The 0% implied probability across prediction markets suggests traders are either awaiting resolution or treating this as a placeholder market with minimal liquidity.

Historical records show Beijing experiences extreme heat in mid-to-late July with regularity. The city recorded 41.9°C on 20 June 2022 and has seen multiple days above 38°C during summer months over the past decade. The settlement window closing at midday UTC on 21 July creates a practical constraint: traders must rely on overnight forecasts and early-morning data rather than a full day's observation. This timing mismatch may explain the absent trading activity, as the market resolves before most Western traders' business hours.

Catalysts for movement centre on seasonal weather patterns and any anomalous atmospheric conditions in early July 2026. China's meteorological authority typically issues heat warnings 3–5 days in advance of extreme events, providing tradeable signals. The absence of comparable sportsbook lines for weather outcomes means prediction-market pricing operates without external reference points. Traders should monitor whether competing platforms (Polymarket, Kalshi) develop liquidity; divergence between venues would indicate genuine uncertainty rather than indifference.

Methodology

This page reviews Highest temperature in Beijing on July 21? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi vs Polymarket, which mirrors the Polymarket order book at 0% fees.

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.

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'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.

Do I need to KYC for this market?

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