Highest temperature in Beijing on August 6?

Platform comparison

Market context

Beijing Capital International Airport is expected to post a hot early-August reading, but the market is pricing a much narrower outcome than the broader summer climatology would suggest. Wunderground will settle the contract on the single highest airport-station temperature reached during the day, not the city-wide forecast, and surrounding sources still point to daytime highs around the mid-30s Celsius for Beijing in early August.[2][3][9] Against that backdrop, the crowd-implied 0% YES looks materially lower than the broader seasonal expectation, especially since Polymarket’s live pricing still clusters around the mid-30s bins rather than the low end of the range.[6]

Historical comparisons lean towards a warm result rather than a cool one: August in Beijing is typically hot and humid, with published climate guides putting average highs around 30°C to 31°C and weather models for 6 August showing forecast highs around 34°C to 36°C.[2][9][14][15][16] That makes the current zero-implied probability difficult to square with the normal summer pattern, although airport-specific outcomes can lag city forecasts if cloud cover, rain bands or a late-day storm cap the maximum at the station.[4][12] In cross-platform terms, the clearest divergence is between the prediction market’s near-zero YES price and the broader weather consensus, while no sportsbook line appears to be quoted here for a direct comparison.[6][2][9]

The main catalysts are the local forecast updates through the day, any convective rain or thunderstorm timing around Beijing, and the final airport-station observation that Wunderground uses for settlement.[3][12] The relevant dependency is not the evening low, but the highest observation recorded before the settlement window closes, so traders are effectively watching whether the day gets enough insolation before cloud or precipitation suppresses the peak.[2][3] Current city forecasts from nearby weather services have shown fine to overcast conditions with highs in the mid-30s Celsius, which is enough to keep the upside bins live if the airport behaves similarly.[3][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets 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.