Highest temperature in Hong Kong on June 27?

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Market context

Hong Kong is currently experiencing its hottest day of the year so far, with temperatures soaring past 34.6°C and a hail warning issued, setting a stark real-world backdrop for traders assessing the June 27 forecast. This extreme heat event underscores the volatility of the current 0% YES probability for the highest temperature range, as recent precedent shows the city frequently breaching 34°C in late June. Historical data from the Hong Kong Observatory indicates that June temperatures often hit 34.6°C, while seasonal forecasts for June-August 2026 predict above-normal temperatures, suggesting the market’s current pricing may be misaligned with the climatic reality of above-average heat [2][10].

Traders should monitor the Hong Kong Observatory’s 9-day weather forecast updates and the finalisation of the “Daily Extract” data, which will determine the official resolution source once published. Recent news confirms the Observatory has warned of extreme heat in the New Territories, with temperatures expected to hit 37°C, a critical catalyst that could shift probabilities if sustained through June 27 [6]. The settlement window ends on 27 June 2026 at 12:00 UTC, and the market cannot resolve until the official “Absolute Daily Max” data is finalized, making the timing of this publication a key dependency for any price movement [1][2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 27? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 PolyGram, 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.

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 PolyGram?

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

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.

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.