Highest temperature in Hong Kong on June 5?

Market context

On 5 June 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius. The market currently prices all temperature ranges at 0% probability on Polymarket, suggesting either insufficient liquidity or that traders are awaiting historical data and seasonal forecasts to establish meaningful positions. Settlement depends entirely on the Observatory's official "Absolute Daily Max" figure published in their Daily Extract, measured to one decimal place.

Hong Kong's June temperatures are shaped by the onset of the southwest monsoon and pre-typhoon season. Historical data shows June daily maxima typically range between 28°C and 34°C, with occasional peaks above 35°C during heat waves. The 0% crowd probability reflects the market's nascent stage rather than any expectation of extreme cold; traders will likely begin positioning once seasonal forecasts from the Hong Kong Observatory or regional meteorological services become available in late May 2026.

Key catalysts include the release of the Asian summer monsoon forecast (typically May), any tropical cyclone activity affecting the region in early June, and real-time weather updates from the Observatory itself. The settlement window closes at 12:00 UTC on 5 June, but final resolution cannot occur until the Observatory publishes its Daily Extract data, which may take several days. Traders should monitor the Observatory's historical temperature patterns and any announced weather warnings or heat advisories as June approaches.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.