Highest temperature in Hong Kong on July 7?

Platform comparison

Market context

Hong Kong will record its peak July 7 temperature in degrees Celsius, resolved strictly by the Hong Kong Observatory’s finalized “Absolute Daily Max” figure. On Polymarket today, the contract for any outcome above the settlement threshold trades at 0% YES, implying the crowd expects the day’s maximum to fall well below the highest bracket. This pricing sits against USDC liquidity on Polygon, where conditional tokens lock in exposure until the 2026-07-07T12:00:00Z settlement window closes.

Historical July climatology frames this near-zero probability. The warmest period in Hong Kong runs from late May to mid-September, with daily highs averaging 33°C, while July averages sit between 28°C and 32°C [3][8]. The Observatory’s seasonal forecast for July–September 2026 projects normal to above-normal temperatures, yet even above-normal peaks rarely breach the extreme ranges required for the top bracket [2]. Comparable July 7 records show maximums consistently in the 31–34°C band, far below the threshold implied by the 0% market price [7].

Traders should monitor the Observatory’s “Daily Extract” publication schedule, as the market cannot resolve until the finalized data appears. The key dependency is the release of the absolute daily maximum to one decimal place, which will confirm the exact range [10]. No immediate weather announcements are expected to alter the baseline, but any sudden typhoon development or heavy rain event before 7 July could suppress peak temperatures, reinforcing the current low-probability stance [5].

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.

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.