Highest temperature in Hong Kong on June 15?

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Market context

The Hong Kong Observatory will record the highest temperature on 15 June 2026, measured to one decimal place in Celsius. This market resolves based on the official "Absolute Daily Max" figure published in the Observatory's Daily Extract once the date has passed and data finalised.

June temperatures in Hong Kong cluster around 28–32°C on average, though daily maxima regularly exceed 33°C during the pre-monsoon season. Historical records show that mid-June often sits at the threshold between spring and early summer conditions; the Observatory's 30-year climate normals place the mean daily maximum at approximately 31°C for this period. Extreme heat days pushing above 35°C occur but remain outliers rather than the norm. The 0% crowd probability suggests traders are either uncertain how to price temperature bands or expect the market to remain unresolved due to data publication delays.

Traders should monitor the Hong Kong Observatory's publication schedule closely, as the market cannot settle until official data appears in the Daily Extract. Seasonal patterns matter: the onset of the southwest monsoon typically moderates temperatures in mid-June compared to May peaks. El Niño or La Niña conditions in early 2026 could shift baseline expectations, though such signals would require tracking meteorological forecasts from January onwards. The settlement window closes at midday on 15 June 2026, creating a tight window for data release and resolution.

Methodology

We track Highest temperature in Hong Kong on June 15? 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

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 Who Will Win 2026, 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?

Who Will Win 2026 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.

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.

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, Who Will Win 2026 triggers a quick verification flow that finishes in minutes.