Highest temperature in Beijing on June 30?

Platform comparison

Market context

The underlying event is the peak of Beijing’s summer heat on 30 June 2026, when the city typically experiences its hottest daily highs, often reaching 35°C or more. Historical data shows that June in Beijing averages highs between 84°F and 87°F (29°C–31°C), with about ten days exceeding 35°C (95°F) [1][2]. In 2023, Beijing recorded its hottest June day in over 60 years at 41.1°C (105.9°F), shattering previous records amid a severe heatwave [3][4]. This precedent suggests that while 0% YES implies near-certainty the temperature will stay below the highest range, extreme outliers are not impossible, especially as climate volatility increases.

Traders should monitor real-time heatwave forecasts and official weather advisories from Chinese authorities, which have previously triggered record-breaking temperatures during similar periods [3]. Recent reports indicate Beijing is bracing for blistering heat as heatwaves return, with temperatures soaring above 41°C in past years [4]. The consensus leans heavily toward the lower range, but contrarian value may exist if a sudden, intense heatwave develops, pushing temperatures toward the upper threshold. Given the 0% implied probability, any shift in forecast models or official warnings could signal a mispriced underdog scenario, offering a rare value spot for those willing to bet against the crowd.

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

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

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.

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.