Highest temperature in Beijing on July 12?

Platform comparison

Market context

Beijing is currently locked in an intensifying heat dome over the North China Plain, with the city experiencing its hottest July in recent history as temperatures routinely shatter past records. The crowd-implied probability for the "YES" outcome sits at 0%, suggesting the consensus firmly believes the peak temperature will fall below the market’s specific threshold. This pricing ignores the historical reality that July is Beijing’s hottest month, where daily highs average 38°C and frequently exceed 40°C, as seen in 2023 when the city reached 40°C [1][5].

Historical data frames the 0% probability as a significant underdog play rather than a safe favourite. While the average high in July is 38°C, extreme heat waves have pushed readings to 41.8°C in June 2023 and sustained peaks above 40°C in July 2024 [3][5]. The consensus appears to be misreading the current weather anomaly, treating a record-breaking heat event as a statistical outlier when the data suggests such extremes are becoming the norm for mid-summer in the capital [7][9].

Traders should monitor real-time updates from the Beijing Capital International Airport Station on Wunderground, the designated resolution source, as the heat dome continues to intensify through the settlement window ending at 12:00 UTC [1]. Recent reports confirm an unprecedented July heat wave sweeping China, with many regions exceeding 35°C, indicating the value spot lies in betting against the 0% implied probability [7]. The market offers a clear contrarian angle where the factual weather trajectory contradicts the crowd’s dismissal of high-temperature outcomes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on July 12? 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

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 Who Will Win 2026. 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 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.