Highest temperature in Hong Kong on June 1?

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Market context

On 1 June 2026, the Hong Kong Observatory will record the day's maximum temperature in Celsius. The market currently prices all temperature ranges at 0% probability on Polymarket, suggesting either minimal liquidity or a technical settlement delay rather than genuine uncertainty about whether a temperature will be recorded. Traders are exchanging conditional tokens on Polygon backed by USDC, with resolution tied directly to the Observatory's published "Absolute Daily Max" figure to one decimal place once the Daily Extract data becomes available.

Hong Kong's June temperatures are remarkably consistent. Historical records show the absolute daily maximum in early June typically ranges between 31–34°C, with the 30-year average around 32°C. The city's subtropical climate produces little volatility in early summer; extreme heat events pushing above 35°C are rare in this month, whilst temperatures below 30°C occur only during unusual weather systems. This historical clustering explains why the market shows zero probability across all ranges—the outcome space is narrow and predictable months in advance.

The key variable affecting June 1st temperatures will be whether a tropical cyclone or monsoon trough approaches the region in late May, which could suppress daytime highs or, conversely, if an anticyclone dominates and drives heat northward from the South China Sea. The Hong Kong Observatory issues seasonal outlooks in May; traders should monitor their late-May forecast updates and any tropical cyclone warnings issued in the week prior. Settlement cannot occur until the Observatory publishes verified data, typically within days of the observation date.

Methodology

This page reviews Highest temperature in Hong Kong on June 1? 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

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 Kalshi UK, 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.

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'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 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.