Highest temperature in Hong Kong on June 29?

Platform comparison

Market context

The Hong Kong Observatory has recorded a maximum temperature of 34.6°C during the hottest 'Mangzhong' on record, yet the current crowd-implied probability for any outcome above 32°C sits at 0% YES. This stark divergence frames the market: while June climatology typically sees highs near 28–32°C, the immediate forecast predicts a broad trough of low pressure lingering over southern China, bringing nine consecutive days of rain that will alleviate intense heat [3]. Heavy squally thunderstorms are expected to peak on Sunday and Monday, driving temperatures down to a cooler range of 26–30°C, which directly supports the prevailing market pricing [3].

Historical data from June 2023, which saw Hong Kong’s hottest summer on record with a mean of 29.7°C, suggests that above-normal temperatures are the seasonal norm for 2026 [4][8]. However, the current weather system is an active anomaly; forecasters warn that unsettled, cloudy conditions and localized thunderstorms will persist into Tuesday and Wednesday, further suppressing peak temperatures [3]. For a Polymarket trader, the key catalyst is the official release of the "Daily Extract" from the Hong Kong Observatory, which finalises the "Absolute Daily Max" once data is published [1]. Until this on-chain resolution source is confirmed, the conditional tokens on Polygon remain locked, with USDC payouts contingent solely on the verified degree Celsius figure [1].

Traders must monitor the HKO’s scheduled announcements regarding the trough’s movement, as any deviation could shift the temperature range unexpectedly [3]. The market cannot resolve until the relevant data for 29 June 2026 is officially published, ensuring that the conditional tokens reflect only the finalized meteorological record [1]. With the settlement window ending on 29 June 2026 at 12:00 UTC, the 0% probability implies the market expects the day’s peak to fall comfortably within the 28–32°C band, aligning with the forecasted cooling trend [1][3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 29? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 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.