Highest temperature in Hong Kong on June 29?

Platform comparison

Market context

The real-world event this market tracks is the highest temperature recorded by the Hong Kong Observatory on 29 June 2026, measured in degrees Celsius. In prediction markets, a YES share pays out if the temperature falls within a specific range you select, while a NO share pays out if it does not. The current crowd-implied probability of 0% YES suggests traders believe the temperature will not hit the highest possible range, yet this view must be weighed against historical context. June in Hong Kong is typically hot, with daily highs often reaching 30–34°C, and recent years have seen record-breaking heat. The Hong Kong Observatory has forecast above-normal temperatures for June–August 2026, citing ENSO conditions and climate models, and 2026 is predicted to be one of the hottest years on record[1][7]. Just this year, Hong Kong recorded its hottest day so far at 34.6°C, with warnings of extreme heat hitting 37°C in the New Territories[2][5].

Traders should monitor the Hong Kong Observatory’s seasonal and daily forecasts, as these are the primary catalysts for temperature shifts. The key dependency is the publication of the “Daily Extract” data for 29 June 2026, which will finalize the “Absolute Daily Max” value needed for resolution[1]. Recent news confirms the Observatory has warned of extreme heat in late June, with temperatures expected to surge[2]. Additionally, the seasonal forecast explicitly states that above-normal temperatures are likely, making a 0% probability for the highest range appear overly cautious[1]. Watch for updates on tropical cyclone activity, which can temporarily lower temperatures, and for official announcements on heatwave conditions. The settlement window ends at 12:00 UTC on 29 June 2026, so all data must be finalized before this time[1].

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

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. 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 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 Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.