Highest temperature in Hong Kong on June 21?

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Market context

Polymarket is pricing this Hong Kong heat contract with **32°C** as the frontrunner at **47%**, while **33°C** is next at **34%** on the USDC market running on Polygon, so the book is leaning towards a warm but not extreme afternoon maximum. For a conditional-token holder, the important point is that settlement depends on the Hong Kong Observatory’s final “Absolute Daily Max” for 21 June, not on any intraday reading or unofficial app estimate, and the market cannot resolve until that daily extract is published. [1][4][9]

The current 0% YES reading only makes sense if you treat the event as a narrow temperature band rather than a binary outcome, because June outcomes in Hong Kong commonly cluster in the high-20s to low-30s under the southwest monsoon. Polymarket’s own event page points to typical June highs of **28–32°C**, which is consistent with the live pricing sitting around 31–34°C outcomes rather than a severe heat spike. Hong Kong has, however, also seen summer-solstice heat close to the top of the range before, including a reported **34°C** on 21 June in prior years, so a hotter-than-expected print is not outside historical experience. [1][5]

Traders should watch the Hong Kong Observatory’s afternoon update cycle, any very hot weather warnings, and whether cloud, rain bands, or monsoon strengthening alter the day’s peak before the observatory files its daily extract. The settlement mechanism matters here: the market is on-chain, but the outcome is pinned to an off-chain official source, so liquidity can reprice quickly as local forecasts move and then stay unchanged until the HKO publishes final data. The Observatory also notes a long-run warming trend in Hong Kong, with annual mean temperatures rising over recent decades, which is relevant context but does not by itself fix the day’s maximum. [4][6]

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 Legit? — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Legit?, 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?

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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?

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