Highest temperature in Beijing on June 30?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded on 30 June 2026 at the Beijing Capital International Airport Station, measured in degrees Celsius. Polymarket prices this contract today with a 0% implied probability for the "YES" outcome, suggesting the market believes the temperature will not fall within the specific range defined for that option. This pricing reflects a stark divergence from historical patterns where June in Beijing routinely sees highs between 35°C and 41°C, with average daily highs climbing from 84°F to 87°F[1].

Historical data frames this current probability as highly anomalous. In recent years, Beijing has recorded its hottest June day in over 60 years, reaching 41.1°C (105.9°F) during a severe heatwave[3]. Furthermore, there are typically about ten days in June where the daily high exceeds 35°C (95°F)[2]. The current 0% pricing implies an expectation of temperatures far below these established norms, which contradicts the typical thermal behaviour of the region during this month.

Traders should monitor the latest meteorological forecasts and any official announcements regarding extreme heat alerts for the Beijing area. Recent news highlights that Beijing has braced for blistering hot weather with heatwaves returning, pushing temperatures above 41 degrees Celsius and smashing June records[4]. The settlement relies on data from Wunderground, so traders must watch for any updates or corrections to the station's recorded daily maximum before the window closes on 30 June 2026 at 12:00 UTC. The on-chain mechanics utilise USDC on the Polygon network with conditional tokens, meaning liquidity flows directly reflect these real-time weather dependencies.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Beijing on June 30? 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 PolyGram, 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.