Highest temperature in Beijing on July 28?

Platform comparison

Market context

On 28 July 2026, Beijing's highest temperature will be recorded at Capital International Airport Station and settled against historical weather data from Wunderground. The current Polymarket pricing reflects 0% probability across all temperature ranges, suggesting either extreme uncertainty among traders or a technical quirk in how conditional tokens have been distributed on Polygon. This is unusual for a weather contract with a defined settlement window and transparent data source, as even rare temperature outcomes typically attract some marginal pricing.

Beijing's July temperatures have historically clustered between 26°C and 34°C, with extreme heat days occasionally pushing toward 37–39°C during particularly intense heatwaves. The summer of 2023 saw multiple days exceed 35°C, whilst 2022 remained cooler with peaks around 32°C. The 0% crowd probability suggests traders may be awaiting clarity on which specific temperature bands the market offers, or there may be liquidity constraints preventing meaningful position-taking on Polygon's USDC settlement layer.

Traders monitoring this contract should track China Meteorological Administration forecasts released in early July 2026, which typically provide reliable 10–14 day outlooks for Beijing. The East Asian summer monsoon pattern and any high-pressure systems developing over northern China in late July will be material drivers. Historical precedent shows that Beijing's hottest July days occur when continental high-pressure systems stall over the region, a pattern meteorologists can identify 5–7 days in advance. Settlement hinges entirely on Wunderground's recorded data from ZBAA station, making that source's operational status on the day itself a minor but real dependency.

Methodology

This page reviews Highest temperature in Beijing on July 28? 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.