Highest temperature in Beijing on July 23?

Platform comparison

Market context

Beijing Capital International Airport’s peak temperature on 23 July will be set by the highest reading reported for that station on the day, with the contract resolving to the temperature band that contains that value. On Polymarket, the crowd is clustered around the high-20s: the leading bracket is **28°C** at **34%**, with **27°C** next at **30%**, which implies a fairly tight market rather than a broad summer-heat consensus.[1]

That pricing sits in line with Beijing’s late-July climatology, when daily highs are often in the upper 20s to low 30s Celsius, but it still leaves meaningful room for cloud cover, showers and timing of convection to cap the day’s maximum. In practical terms, the current 0% YES view looks much more like a placeholder than a true statement of expected weather, because the live distribution on the contract is concentrated around adjacent temperature buckets rather than a one-sided call.[1]

For traders, the key catalysts are the intraday forecast updates that affect the airport station itself, especially changes in precipitation timing, afternoon cloud cover and any heat build-up before rain arrives. The settlement source is Wunderground’s historical page for Beijing Capital International Airport Station, and the market notes that revisions can occur until the first datapoint for the following day is published, so late updates to the recorded maximum still matter if they appear before that cut-off.[1]

Sources: 1

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 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 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.

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.