Highest temperature in Beijing on July 23?

Platform comparison

Market context

Beijing’s July 23 high is being priced by the crowd as a fairly tight call around the upper 20s Celsius, with the 28°C band dominant and 29°C a distant second. On the cited prediction market page, the 28°C outcome is shown at 90%, while 29°C is at 11%, which implies a very heavy concentration on a mild summer day rather than a broad distribution across the late-20s range.[1]

That positioning is broadly consistent with Beijing’s summer climatology, where July is typically hot and humid but not necessarily extreme every day. A travel-weather guide for Beijing lists 23 July conditions as light rain, northeasterly wind and 90% humidity, which is the kind of setup that can cap daytime highs even when the season is warm.[2] A separate July weather archive for Beijing also shows a recent 34°C reading within the month, illustrating that the city can still produce materially hotter outcomes when skies clear and heating is stronger.[3]

For traders, the key catalyst is the actual airport-station maximum at Beijing Capital International Airport, not downtown conditions or a citywide average, so local cloud cover, rain bands and wind direction matter more than broader seasonal expectations. The market settles on the highest temperature recorded there during the day, so any late-afternoon warming before the observation window closes can still matter if skies break, while persistent cloud or precipitation would reinforce the lower-band consensus already embedded in the odds.[1][2]

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in Beijing on July 23? 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 Kalshi vs Polymarket, 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

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.

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.