Highest temperature in Hong Kong on June 27?

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Market context

The real-world event hinges on the Hong Kong Observatory’s recorded absolute daily maximum temperature in degrees Celsius for 27 June 2026, with settlement confirming which range contains that peak. Current crowd-implied probability for a “YES” outcome sits at 0%, yet market data shows 30°C as the frontrunner at 67% probability, followed by 29°C at 21%, suggesting traders are pricing in above-normal heat rather than ruling it out entirely[1].

Historical context frames this probability: Hong Kong recently logged its hottest day of 2026 so far, with temperatures hitting 34.6°C on 24 June, accompanied by a hail warning due to extreme heat[9]. Seasonal forecasts for June–August 2026 predict above-normal temperatures across the region, reinforcing the plausibility of high readings on 27 June[2]. This recent extreme and seasonal trend make the 0% “YES” probability appear inconsistent with observed weather patterns, indicating potential mispricing.

Traders should monitor the Hong Kong Observatory’s Daily Extract release schedule, as data finalisation is required before resolution[8]. Recent news confirms extreme heat warnings issued by the Observatory, with temperatures exceeding 34°C in late June, a clear catalyst for elevated readings[7]. Additionally, watch for updates on ENSO status and climate model adjustments, which influence regional temperature forecasts[2]. Accessibility remains high for this market under German GlüStV and US CFTC frameworks, where “no-KYC up to $1,500” allows retail participation without identity verification, though regulatory oversight may tighten if trading volumes surge.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

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.

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.