Highest temperature in Beijing on July 23?

Platform comparison

Market context

Beijing Capital International Airport is the reference point, and the market is currently pricing **28°C** as the favourite at **34%**, with **27°C** close behind at **30%**; the consensus is clustered around the high-20s, which leaves the **0% YES** view for the target range clearly an extreme outlier.[1] For a handicapper, that makes the **underdog** side in the higher- or lower-band outcomes the main value question rather than a broad directional call, because the distribution is already tight and the market is signalling limited separation between the leading temperature bins.[1]

That sort of pricing usually fits midsummer Beijing well: the city can still reach the high 20s even when cloud cover or an afternoon shower trims the peak, while hotter readings tend to depend on stronger sunshine and delayed convection. With the settlement based on the **highest** reading recorded on the day, not a daily average, the key comparable cases are days where the afternoon high lands just below or just above the consensus band, rather than extreme heatwave events. In that sense, the consensus around 28–31°C looks like the fair favourite cluster, while the value spot sits in whichever adjacent band benefits from a brief clear-sky window or a rain-cooled cap.[1]

The main catalysts to watch are the short-range Beijing forecast, the timing of any cloud build-up or precipitation, and whether the airport station logs its warmest reading before showers or a wind shift arrive. The market rules also matter: revisions to temperature records count only until the first datapoint for the following day is published, so late data corrections can move settlement if they appear before that cutoff.[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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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.

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 Who Will Win 2026 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.