Highest temperature in Beijing on July 28?

Platform comparison

Market context

Beijing's highest temperature on 28 July 2026 will be recorded at the Capital International Airport Station and resolved against historical Weather Underground data. The settlement window closes at midday UTC on that date, capturing the full diurnal cycle for the day in question. The 0% crowd-implied probability across major prediction platforms suggests either extreme confidence in a specific temperature range or minimal trading activity on this particular contract variant.

July temperatures in Beijing historically cluster between 25–35°C, with extreme heat events pushing above 38°C occurring roughly once per decade. The city's 2010 heat wave saw peak temperatures exceed 40°C, whilst more recent summers (2022–2024) have produced several days exceeding 37°C during late July. The current zero probability reading likely reflects either settlement mechanics that exclude certain ranges entirely or insufficient liquidity to establish meaningful odds across all available brackets. Cross-platform comparison shows prediction markets have not yet developed consensus pricing on this specific date-location pairing, distinguishing it from broader seasonal temperature forecasts that attract deeper trader participation.

Traders monitoring this contract should track China Meteorological Administration seasonal outlooks and any El Niño or La Niña transitions affecting Northern Hemisphere summer patterns. Real-time catalysts include late-June atmospheric pressure systems and monsoon intensity forecasts, which typically become clearer by early July. Historical precedent suggests late-July Beijing temperatures remain highly path-dependent on June–early July weather patterns rather than long-range deterministic forecasts, making near-term meteorological data releases the primary information events for repricing.

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 Kalshi vs Polymarket, 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 Kalshi vs Polymarket. 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 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 Kalshi vs Polymarket 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.