Pronóstico: Highest temperature in Hong Kong on June 27?

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Market context

The Hong Kong Observatory is set to record its absolute daily maximum temperature for 27 June 2026, a single data point that will determine the outcome of this on-chain prediction contract. Currently, Polymarket prices the "YES" option at 0%, implying the crowd believes the temperature will fall outside the specific range being traded, despite the seasonally high heat expected in the region. This market resolves strictly on the official "Absolute Daily Max (deg. C)" once finalized in the Daily Extract, with settlement occurring on the Polygon network using USDC conditional tokens.

Historical precedents suggest the current 0% probability is an aggressive stance given Hong Kong’s summer volatility. In June 2024, the Observatory recorded a peak of 34.4°C on the exact same date, 27 June, marking the highest temperature of that month [10]. Recent news confirms the city is already experiencing extreme heat, with temperatures soaring past 34.6°C earlier this year and triggering hail warnings [5]. The Hong Kong Observatory’s seasonal forecast for June to August 2026 explicitly predicts above-normal temperatures, reinforcing that a cool day is statistically unlikely [2].

Traders must monitor the official publication schedule of the Daily Extract, as the market cannot resolve until this data is finalized. The primary catalyst is the release of the official temperature reading, which depends on the Observatory’s multi-model consensus system [9]. Any sudden shifts in the ENSO status or local weather model updates could alter the final figure, though the current forecast remains firmly above normal [2]. Investors should also watch for real-time updates from the Hong Kong Observatory regarding extreme heat warnings, as these often precede the highest daily readings [6]. The settlement window closes at 12:00 UTC on 27 June 2026, locking in the final outcome based on the verified Celsius reading.

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 PolyGram, 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 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.

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 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.

Do I need to KYC for this market?

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