Highest temperature in Beijing on July 7?

Platform comparison

Market context

On 7 July 2026, the Beijing Capital International Airport Station will record its peak temperature for the day, a single real-world data point that determines the outcome of a prediction market with a current crowd-implied probability of 0% for the highest temperature range. This near-zero valuation suggests traders believe the event is impossible, yet historical patterns contradict such certainty. Beijing’s all-time high of 41.9°C occurred on 24 July 1999, while a separate dataset records a peak of 42.1°C on 5 July 2010, just two days before the market’s settlement date [1][2]. Average July highs in the city typically hover around 31°C (88°F), rarely dipping below 26°C or exceeding 36°C, meaning temperatures in the 30–35°C range are statistically common [3]. The 2023 July peak reached 40°C, and China’s national records confirm July 2024 was the hottest month in recent history, with average temperatures exceeding previous benchmarks by 0.04°C [5][4].

Traders should monitor the China Meteorological Administration’s daily heatwave advisories and the Beijing Municipal Emergency Response Office’s public warnings, which have recently urged residents to limit outdoor exposure due to extreme heat [1]. A key catalyst is the upcoming monsoon activity forecast for mid-July, which could suppress temperatures, but recent data shows the highest temperature in the last 15 days reached 35.8°C on 3 July 2026, indicating persistent heat [6]. Asia News Network reports that China’s July temperatures set a national record, with the highest average temperature since official releases began [7]. The divergence between sportsbook lines, which may offer odds on extreme heat, and the prediction market’s 0% probability is notable; analysts often cite the 2010 and 2023 peaks as evidence that a 40°C+ day is plausible, challenging the market’s current dismissal of the event [5][2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Beijing on July 7? 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

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

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.

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 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.