Highest temperature in Hong Kong on June 27?

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Market context

On 27 June 2026, Hong Kong will experience its peak daily temperature, measured in degrees Celsius by the Hong Kong Observatory, to determine which range resolves the prediction market. Today, Polymarket prices the contract with a 0% probability for the "YES" outcome, implying traders believe the temperature will not fall into the specific range being bet on, while the frontrunner is 30°C at 67% probability[1].

Historical June data frames this low probability: the Observatory’s seasonal forecast for June–August 2026 predicts above-normal temperatures across Hong Kong, with daily highs typically ranging from 88°F to 92°F (31.1°C to 33.3°C)[3][4]. Recent records reinforce this trend, as Hong Kong hit 34.6°C on 26 June 2026, marking the hottest day of the year so far[10], and the Observatory warned of extreme heat reaching 37°C in the New Territories just days prior[7].

Traders should monitor the Hong Kong Observatory’s "Daily Extract" publication schedule, as the market cannot resolve until the "Absolute Daily Max" is finalized[3]. Key catalysts include the 9-day forecast updates, which currently show a range of 27–31°C for 27 June, and any sudden shifts in ENSO status or cloud cover that could alter peak temperatures[8]. The settlement window closes at 12:00 UTC on 27 June 2026, making the timing of data release critical for on-chain conditional token settlements on Polygon using USDC[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on June 27? 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 Kalshi UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Kalshi UK?

Zero. Kalshi 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 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, Kalshi UK triggers a quick verification flow that finishes in minutes.