Highest temperature in Beijing on June 30?

Platform comparison

Market context

Beijing is currently experiencing a sharp heat spike, with Monday night’s conditions at the Capital International Airport recording 77°F (25°C) and oppressive humidity of 83%, a notable shift from the cooler start to the month[3]. This sudden rise in temperature and moisture has pushed the crowd-implied probability for a 30°C+ high on June 30 to 0%, despite the day falling within the month’s warmest ten-day window (days 21–30), which historically averages highs of 26.4°C (79.5°F)[2]. The market’s extreme bearish stance appears to ignore the fact that June typically features about ten days with highs reaching 35°C (95°F) or above, suggesting the current pricing may be overly reactive to recent cloud cover rather than the underlying seasonal trend[1].

Traders should monitor the upcoming 48-hour forecast for the Beijing region, specifically any announcements from the China Meteorological Administration regarding heatwave warnings, as these often precede sustained high-temperature events. Recent data indicates that daily highs in July 2026 are forecast to range from 79°F to 95°F, implying that the current June 30 dip may be temporary[4]. The key dependency is the resolution of the current high-pressure system; if it breaks, temperatures could surge rapidly toward the 30°C threshold. Watch for real-time updates on Wunderground for the Capital International Airport Station, as the market resolves strictly on the highest recorded temperature for all times on that day, making late-evening spikes critical to the outcome.

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.

Do I need to KYC for this market?

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