Highest temperature in Hong Kong on July 2?

Platform comparison

Market context

The real-world event is the highest temperature recorded by the Hong Kong Observatory on 2 July 2026, measured in degrees Celsius to one decimal place. This single data point will determine the market resolution, with the current crowd-implied probability of 0% suggesting traders expect the temperature to fall outside the specific range being bet on.

Historical patterns frame this near-zero probability as a rational assessment rather than an outlier. July in Hong Kong typically sees daily highs between 86°F and 96°F (30°C to 35.6°C), with an average of 89°F (31.7°C) [2]. Recent data confirms this trend, as the city recorded its hottest day of the year so far on Friday at 34.6°C (94.3°F) [9]. The seasonal forecast for July to September 2026 predicts normal to above-normal temperatures, influenced by the current ENSO status [1]. Given that 2026 is already flagged as potentially one of Hong Kong's ten hottest years [6], the 0% probability likely reflects a mismatch between the bet range and these established high-temperature baselines rather than a belief in cold weather.

A power-user approaching this programmatically must monitor the official "Daily Extract" release from the Hong Kong Observatory, as the market cannot resolve until this data is finalized [4]. The primary catalyst is the scheduled publication of the "Absolute Daily Max" for 2 July, which will be the definitive settlement source. Traders should also watch for real-time updates on the Pearl River Delta region, as multi-model consensus forecasts there often correlate with local extremes [8]. While no specific weather announcement is pending for this exact date, the broader context of abnormally high temperatures expected in 2026 [5] serves as a critical dependency for any algorithmic model evaluating the likelihood of extreme heat. The settlement window ends at 12:00 UTC on 2 July 2026, requiring automated systems to fetch the finalized data immediately after publication.

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.

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