Highest temperature in Hong Kong on June 10?

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Market context

The Hong Kong Observatory will record the highest temperature in degrees Celsius on 10 June 2026, with settlement contingent on publication of the official daily extract. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty about temperature ranges or insufficient liquidity to establish consensus pricing.

Hong Kong's June climate sits firmly within the pre-monsoon season, characterised by heat and humidity ahead of the southwest monsoon onset. Historical data from the Observatory shows June daily maxima typically range between 28–32°C, with occasional excursions above 33°C during particularly intense heat episodes. The 1998–2023 period recorded June absolute daily maxima clustering around 31–32°C as modal outcomes, though extreme heat days pushing toward 35°C occur roughly once per decade. The 0% implied probability reflects the market's inability to price specific temperature bands rather than genuine certainty that no outcome will occur.

Traders should monitor seasonal forecasting updates from the Hong Kong Observatory and regional meteorological bodies through May and early June 2026, as these will signal whether atmospheric conditions favour above-normal or below-normal temperatures. The timing of the southwest monsoon onset—typically mid-May to early June—acts as a primary catalyst; early onset would suppress temperatures through increased cloud cover and precipitation, whilst delayed onset extends the pre-monsoon heat window. El Niño or La Niña conditions developing through 2025–2026 will also influence regional temperature patterns. Resolution depends entirely on Observatory publication timelines, which historically occur within days of the observation date.

Methodology

We track Highest temperature in Hong Kong on June 10? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 Who Will Win, 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'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 Who Will Win?

Zero. Who Will Win routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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