Highest temperature in Beijing on June 30?

Platform comparison

Market context

The underlying real-world event is the peak temperature recorded at Beijing Capital International Airport on 30 June 2026, a date that historically sits within Beijing’s most intense summer heat window. Current crowd-implied probability for the “YES” outcome is 0%, yet Polymarket prices the 28°C range at 40% and 29°C at 31%, reflecting a market that expects warm but not extreme conditions[1]. This divergence suggests traders are betting on a typical June high rather than a record-breaking spike.

Historical data shows June highs in Beijing usually range between 28°C and 35°C, with about ten days exceeding 35°C this month[2][3]. While Beijing recorded its hottest June day in 60 years at 41.1°C in 2023, such extremes are rare and not typical for late June[4][5]. The current 0% probability implies the market sees no immediate threat of a heatwave, aligning with seasonal averages rather than outlier events.

Traders should monitor official heatwave announcements from the China Meteorological Administration and any scheduled weather bulletins ahead of 30 June, as these can shift conditional token pricing rapidly on Polygon. Recent news confirms Beijing remains under active heatwave watch in early summer, with temperatures soaring above 41°C in past years[5]. On-chain mechanics using USDC and conditional tokens will react instantly to such updates, making real-time news feeds critical for positioning before the settlement window closes at 2026-06-30T12:00:00Z.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on June 30? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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 Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.