Highest temperature in Hong Kong on June 5?

Market context

Hong Kong's highest temperature on 5 June 2026 will be recorded by the Hong Kong Observatory and published in their Daily Extract climate data. The settlement window closes at midday UTC on that date, though final resolution depends on the Observatory publishing their absolute daily maximum temperature to one decimal place Celsius. The 0% crowd-implied probability suggests traders are either highly confident in a specific temperature range or have not yet engaged substantially with this contract.

Hong Kong's June climate is characterised by early monsoon transition and rising heat ahead of the summer peak. Historical data from the Observatory shows June daily maxima typically range between 28–32°C, with occasional readings reaching 33–34°C during heat waves. The 5 June date falls early in the month, before the most intense heat typically arrives in July and August. Comparable years and seasonal patterns provide the primary framework for assessing probability distributions across temperature bands, as June represents a transitional month between spring and summer conditions.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any issued heat advisories as June approaches. Broader Asian weather patterns, including the onset timing of the southwest monsoon and any tropical systems in the region, will influence actual conditions. The Observatory publishes extended forecasts on their website; near-term forecasts become more reliable within two weeks of the settlement date. Cross-platform comparison shows minimal activity on this contract currently, suggesting limited consensus pricing exists between prediction markets and traditional weather forecasting outlets.

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