Highest temperature in Beijing on July 4?

Platform comparison

Market context

Beijing is facing another intense summer heatwave, with the Beijing Capital International Airport Station set to record its peak temperature for 4 July 2026. The current crowd-implied probability of 0% YES suggests the market believes the temperature will not exceed the highest threshold being traded, despite historical data showing July is Beijing’s hottest month.

Historical records frame this probability with caution: Beijing’s all-time high of 41.9°C occurred on 24 July 1999, while a 42.1°C peak was recorded on 5 July 2010[1][3]. Average daily highs in July hover around 31°C (88°F), rarely dipping below 26°C or exceeding 36°C[4]. Recent years show rising extremes, with 40°C reached in July 2023 and China recording its hottest month in recent history in July 2024[5][6]. This context makes a 0% YES probability appear thin, especially as one platform prices 35°C at 37.5%[2].

Traders should monitor official heat advisories and humidity forecasts, as high moisture levels can push temperatures beyond dry-air expectations. The National Climate Center has flagged record-breaking July temperatures nationally, with deputy director Jia Xiaolong noting a 1.1°C rise above the 2017 average[9]. Authorities have already urged people to limit outdoor time during peak heat, indicating sustained high temperatures[1]. Weather models and thin trading volume suggest divergence between prediction-market odds and analyst consensus, warranting close attention to Wunderground’s final reading for resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on July 4? 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.

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.

Do I need to KYC for this market?

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