Highest temperature in Qingdao on July 9?

Platform comparison

Market context

On 9 July 2026, the highest temperature recorded at Qingdao Jiaodong International Airport will determine the outcome of a prediction market contract, with the current crowd-implied probability of a "YES" result sitting at 0%. This stark divergence from other platforms is notable: Polymarket shows a 47% implied probability for 30°C and a 75.5% collective probability for temperatures reaching 31°C or higher, while historical July averages for Qingdao hover near 28°C. The discrepancy suggests a significant mispricing between the 0% line on one venue and the strong climatological consensus elsewhere, where analysts view above-normal summer warmth as the clear market leader.

Traders should monitor real-time Wunderground updates for the airport station, as the resolution source relies exclusively on this data feed. Recent climatological models indicate that peak heatwave events in this region have historically pushed temperatures to 33°C, with the 2018 record set on 9 August serving as a critical comparable case for mid-summer extremes [7]. While the mean July maximum historically sits between 25°C and 26°C, the current 2026 weather patterns suggest a shift toward higher thresholds, making the 31°C+ range the most probable outcome despite the 0% odds on the specific platform in question [4]. The settlement window closes at 12:00 UTC on 9 July, requiring immediate attention to any data revisions before the first datapoint for 10 July is published [1].

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

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 PolyGram. 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.

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 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.