Highest temperature in Qingdao on June 29?

Platform comparison

Market context

The real-world event driving this market is the peak daily temperature recorded at Qingdao Jiaodong International Airport on 29 June 2026, measured in degrees Celsius. Historical data confirms that June in Qingdao is solidly warm, with average highs typically sitting in the high 20s Celsius, rarely breaching 30°C unless an intense heatwave occurs [6]. The current crowd-implied probability of 1% for a "YES" outcome suggests traders are betting against a record-breaking spike, aligning with the norm that temperatures usually hover between 25°C and 28°C during this month [7]. While the warm season officially begins around 10 June and sees average highs above 74°F, the 33.1°C peak recorded in August 2018 remains an outlier rather than a June expectation [1][5].

A power-user evaluating this market programmatically would focus on meteorological catalysts such as the arrival of a continental high-pressure system or a sudden shift in the East Asian monsoon, which are the primary dependencies for extreme heat. Traders should monitor real-time forecasts from AccuWeather, which currently project daily highs ranging from 79°F to 84°F (approximately 26°C to 29°C) for June 2026, indicating a low likelihood of exceeding the threshold required for a "YES" resolution [3]. The settlement relies on Wunderground data, so any automated bot must verify the station’s specific timestamp for the daily maximum, as the resolution source captures the highest temperature recorded for all times on that day [4]. Without a confirmed forecast of a severe heatwave, the 1% probability reflects a rational assessment of the region’s typical climatic behaviour.

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

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'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.

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 Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.