Highest temperature in Beijing on July 4?

Platform comparison

Market context

Beijing’s summer heat is intensifying as the city approaches its hottest month, with July historically averaging 31–32°C and occasional synoptic spikes pushing temperatures 2–4°C higher. The current prediction market for the highest temperature on 4 July 2026 at Beijing Capital International Airport shows a 0% implied probability for any outcome above 35°C, yet Polymarket assigns 25% to 35°C and 23% to 34°C, while Lines.com prices 35°C at 37.5%. This divergence between platforms suggests thin volume and shifting trader sentiment, contrasting with the flat 0% line on the primary market and the analyst consensus that 35°C remains a plausible upper bound.

Historical records reinforce the plausibility of high July temperatures: Beijing’s all-time peak of 41.9°C occurred on 24 July 1999, and in 2023 the city reached 40°C in July. Daily highs in July typically hover around 88°F (31°C), rarely dipping below 78°F (26°C) or exceeding 96°F (36°C), with the highest average on 17 July. Recent heatwaves, including a 41.1°C reading in June 2023, show that extreme temperatures are not anomalous in this period. Traders should monitor official weather bulletins from the China Meteorological Administration and Wunderground’s real-time updates for the Beijing station, as sudden shifts in cloud cover or wind patterns could alter the peak. A Reuters report from June 2023 noted authorities urging people to limit outdoor exposure during blistering heat, underscoring the public health impact of such extremes.

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

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 Best Prediction Markets UK. 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.