Highest temperature in Hong Kong on June 21?

Platform comparison

Active sub-markets

Market context

The real-world event is the Hong Kong Observatory’s **highest recorded temperature** on 21 June 2026, measured in Celsius and published later in the finalized daily extract. The current crowd-implied **0% YES** is strikingly low for a summer-solstice temperature market, especially given the Observatory’s own seasonal outlook that June–August 2026 is expected to be **above-normal** in temperature[3]. Recent conditions also show that Hong Kong has already produced very hot readings this season, with the Observatory logging **33.7°C** as the year’s highest temperature by mid-afternoon in a recent heat episode[2].

Comparable cases suggest traders usually anchor on whether a late-day heat peak is still plausible, not on morning readings. Hong Kong has previously matched its hottest summer-solstice record at **34°C**, showing that extreme readings on 21 June are not exceptional in the local climate context[8]. Even the Observatory’s tourist forecast page showed a 21 June reading in the mid-20s at one point, which underlines how quickly expectations can shift as the day develops and why early pricing can be misleading[1][9]. For a market settled on the day’s **maximum**, the key comparison is often the gap between the opening temperature and the afternoon peak, rather than the broad daily average.

Traders should watch the Observatory’s short-range forecast updates, any heat warning or extreme-temperature statements, and the eventual Daily Extract, because settlement depends on the final published **“Absolute Daily Max (deg. C)”** for that date[5]. Accessibility is also shaped by market structure: under German **GlüStV** rules, platforms offering this kind of betting-like exposure may face stricter local gambling compliance questions, while the US **CFTC** can still matter where a contract is viewed as a derivative-style event market rather than a pure wager. The “**no-KYC up to $1,500**” position typically means smaller balances or trading limits may be available without identity checks, but that does not remove jurisdictional or source-of-funds constraints if they apply to this specific market.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket KYC UK, which mirrors the Polymarket order book directly.

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 KYC 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.

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.

What does it cost to trade on Polymarket KYC UK?

Zero. Polymarket KYC UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.