Highest temperature in Beijing on July 31?

Platform comparison

Market context

Beijing Capital International Airport is in the summer heat zone now, and the market’s 0% YES price makes the **under** look like the favourite by a wide margin. The resolution source is the day’s *highest* airport temperature on 31 July, so the key question is not whether Beijing is warm, but whether it breaks well above the market’s current consensus and into a hotter band than traders are pricing.

On the history, late July is normally Beijing’s hottest stretch, with typical highs around **31°C** and occasional spikes into the mid-to-high 30s, including a cited 31 July extreme of **35.9°C** on one historical guide and an airport monthly average around **31°C / 87°F** on AccuWeather. That makes a low-probability zero-ish price vulnerable if the day runs hot, because the statistical baseline is not cool-weather territory; the contrarian angle is that the airport reading can still undershoot city-centre heat if cloud, rain, or a wind shift caps the maximum before mid-afternoon.

For traders, the main catalysts are the Beijing afternoon forecast, any thunderstorm or monsoon-style rain band, and whether peak heating arrives before convection knocks temperatures back. Beijing’s July climate is also rainy, so a wet or cloudy day can compress the upside even in a hot month. With the settlement window ending at 12:00 UTC, the relevant watchpoint is the local early-to-mid afternoon period when the airport typically posts its maximum; if the morning has already underperformed but skies stay clear, the favourite can still be the hotter temperature bands rather than the current zero-priced no-hit view.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Beijing on July 31? 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

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

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 Who Will Win 2026. 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 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.