Highest temperature in Hong Kong on June 21?

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Market context

Polymarket is pricing this Hong Kong maximum-temperature contract at **0% YES** right now, so the market is effectively saying a qualifying outcome is not being paid for in USDC on Polygon at the moment. The underlying event is straightforward: the Hong Kong Observatory will later publish the **“Absolute Daily Max (deg. C)”** for 21 June 2026, and the contract settles against the temperature band containing that figure once the daily extract is finalised.[1]

For context, Hong Kong’s late-June heat can still produce very high readings, even if the crowd is currently assigning no probability to the relevant band. The Observatory’s seasonal outlook for June to August 2026 calls for **above-normal temperature** conditions, while a recent local report said the city had already seen a maximum of **33.7°C** earlier in the year, and another source noted Hong Kong matched its record for the hottest summer solstice at **34°C** on 21 June in a previous year.[1][3][6] For a trader, that means the live probability is mainly a reflection of where the day’s peak ends up relative to the market’s temperature bucket, rather than whether Hong Kong is generally hot.

The key catalysts are the Observatory’s day-by-day weather statements, any heat warnings, and the eventual daily extract release, because the market cannot resolve until that data is published.[1] Forecast services are currently projecting June highs in the low-30s Celsius, with AccuWeather showing June daily highs around **89°F to 94°F** and an average high of **91°F** for Hong Kong, which supports continued attention to the upper end of the range.[2] Traders watching the conditional tokens should therefore focus on whether the Observatory’s official maximum lands inside the contract’s settlement interval once the final extract appears.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on June 21? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.