Highest temperature in Beijing on June 30?

Platform comparison

Market context

On 30 June 2026, the Beijing Capital International Airport Station will record its highest temperature for the day, a real-world metric that determines the outcome of a prediction market where the crowd currently assigns zero per cent probability to any “yes” result. This near-total dismissal of a positive outcome suggests traders believe the temperature will fall outside the defined range, despite Beijing’s notorious summer heat. The market resolves based on Wunderground’s official daily high, measured in degrees Celsius, with settlement ending at 12:00 UTC on the same day.

Historically, June in Beijing is blistering: average highs climb from 84°F to 87°F (29°C to 31°C), with roughly ten days exceeding 35°C (95°F) [2][3]. In 2023, the city shattered its June record, soaring to 41.1°C (105.9°F)—the hottest June day in over 60 years and the second-highest temperature ever recorded in the capital [1][4]. Such extremes frame the current 0% implied probability as potentially mispriced; if a heatwave mirrors 2023 conditions, the temperature could easily breach the threshold, creating a stark divergence between sportsbook lines (which often hedge on extreme weather) and the prediction market’s flat odds.

Traders should monitor the National Meteorological Centre’s heatwave advisories and the China Meteorological Administration’s daily forecasts, which frequently update ahead of peak summer days [1]. Recent reports note that heatwaves returning to northern China have already driven temperatures past 41°C in previous years, suggesting a catalyst for sudden spikes [1]. With no official temperature announcement yet for 30 June 2026, the market remains vulnerable to real-time data from Wunderground, where a single degree above the threshold could invalidate the crowd’s zero-confidence stance. Analyst consensus on similar contracts often leans toward caution, yet the current odds imply an almost certain miss—a divergence worth scrutiny.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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.

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.

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.