Highest temperature in Beijing on August 8?

Platform comparison

Market context

Polymarket is pricing this Beijing heat contract at **0% YES**, which means the market currently assigns no probability to the airport station’s daily high landing in the specified temperature band. On Polymarket, holders of USDC on Polygon trade conditional tokens against a resolution sourced from Weather Underground’s Daily Observations table, so the relevant number is the highest recorded reading at Beijing Capital International Airport Station during the settlement window, not the summary “Day High & Low” figure.[14][16]

That zero price is best read against Beijing’s normal August climate, where daytime highs are typically around **31°C** and the monthly record high is far above that baseline.[10][8] Recent historical pages for Beijing also show August 8 averages in the low-30s Celsius, with daily highs commonly clustering in the **31–34°C** area and occasional extremes higher than that.[5][15] For a market resolving on a single day’s station reading, 0% implies traders see the chance of a threshold-clearing spike as negligible rather than merely unlikely.[3][9]

A trader watching this contract should focus on the intraday weather sequence at Beijing Capital International Airport: early-afternoon warming, showers, cloud cover, and any gusty outflows can all change the top reading before the 12:00 UTC settlement cut-off.[1][6] The practical dependency is the timestamped observation stream on Weather Underground, because the market resolves from that table alone if it diverges from the site’s headline summary.[14] Reuters has also reported that Beijing can experience sharp heat spikes and record-breaking summer temperatures during regional heatwaves, which is the main catalyst that could force an unexpectedly high station maximum on a single day.[19]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on August 8? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.

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.