Highest temperature in Hong Kong on July 13?

Platform comparison

Market context

The market bets on the peak Celsius reading Hong Kong Observatory will log for 13 July 2026, with the crowd currently pricing a YES outcome at 0%. This zero implies the consensus expects the day’s maximum to fall outside the specific range offered, likely viewing the target as an underdog against typical mid-summer heat. Historical data frames this scepticism: July is Hong Kong’s hottest month, with a 30-year average high of 31.8°C and record daily extremes exceeding 34°C in exceptionally hot years like 2024 [1][7]. The 2024 month saw daily means of 30.8°C, suggesting that while 34°C+ is possible, the specific range in question may be too high for the current forecast, which projects highs between 29°C and 34°C (84°F–94°F) [2].

Traders should monitor the Hong Kong Observatory’s daily extract for the “Absolute Daily Max” once finalized, as settlement hinges entirely on this official figure [7]. The immediate catalyst is the weather pattern over the next few days; recent data shows a peak of 33.7°C (92.7°F) on 11 July 2026, indicating the region is already in a hot spell [3]. If a tropical cyclone or heavy rain band approaches before 13 July, temperatures could drop significantly, validating the 0% crowd price. Conversely, a persistent high-pressure system with clear skies could push readings toward the upper forecast limit, creating a contrarian value spot if the range is near 33°C–34°C. The market remains unresolved until the Observatory publishes the final daily data.

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

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 Who Will Win. 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.

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