Highest temperature in Hong Kong on June 29?

Platform comparison

Market context

Hong Kong is bracing for above-normal temperatures this June, with the Hong Kong Observatory forecasting a season that could push daily highs well beyond the historical average[1]. The current crowd-implied probability of 0% YES on the prediction market for the highest temperature on 29 June 2026 appears starkly divergent from analyst consensus, which leans heavily toward extreme heat conditions[4]. While sportsbook lines on similar weather contracts often reflect a 60–70% chance of temperatures exceeding 35°C, this market’s zero probability suggests either a mispricing or an unusually narrow temperature-range definition that excludes likely outcomes[3].

Historical data frames this divergence clearly: June 2026 has already seen Hong Kong record its hottest day of the year so far at 34.6°C, with New Territories hitting 37°C in recent warnings[2][5]. February 2026 was exceptionally warm, reaching 26.9°C, setting a precedent for rising seasonal baselines[6]. These comparable cases indicate that a 0% probability is inconsistent with observed trends, especially as 2026 is projected to be one of Hong Kong’s hottest years on record[8]. Traders should monitor the Observatory’s finalised “Daily Extract” for 29 June, which will confirm the absolute daily maximum and resolve the market[1]. Any delay in data publication or updates to the ENSO status could shift implied probabilities dramatically[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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'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 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.