Pronóstico: Highest temperature in Hong Kong on July 18?

Platform comparison

Market context

Hong Kong's peak temperature on 18 July 2026 will be measured by the Observatory's official thermometer network and recorded to one decimal place. The market currently shows zero probability assigned to any outcome, reflecting either minimal trading activity or extreme uncertainty about which temperature band will resolve. Settlement depends on the Observatory publishing its "Absolute Daily Max" figure in the Daily Extract dataset after the date passes, meaning traders cannot exit positions until official data becomes available—typically within days of the observation date.

July sits within Hong Kong's peak summer season, when daily maxima routinely exceed 32°C. Historical Observatory records show that mid-July temperatures in the territory have ranged from 33.5°C to 36.3°C over recent decades, with heat waves occasionally pushing toward 37°C. The 2015 heat wave saw temperatures reach 36.1°C on 18 July itself, providing a direct precedent for this specific calendar date. Humidity levels compound the heat stress, though the Observatory measures dry-bulb temperature rather than apparent temperature.

Traders should monitor the Asian summer monsoon patterns and any tropical cyclone activity in the weeks preceding mid-July 2026, as both significantly influence Hong Kong's temperature profile. The Observatory publishes seasonal outlooks and monthly forecasts that may offer early signals about whether the summer will trend warmer or cooler than the 30-year normal. Any El Niño or La Niña conditions developing in the Pacific will also shape regional atmospheric circulation patterns affecting the territory's weather in July.

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

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 Polymarket Qué Es. 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'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 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.