Highest temperature in Hong Kong on June 23?

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Active sub-markets

Market context

Hong Kong is bracing for its hottest day of 2026, with the Observatory already recording a peak of 35.6°C on Tuesday, marking the year’s most extreme heat so far[6]. This surge follows a series of warnings about record-breaking temperatures, as climate officials raise alarms over escalating global warming trends[6]. The current prediction market for June 23 shows a stark divergence: while one platform prices 33°C at 62%[1], another implies a 56% chance for the same outcome, and the crowd-implied probability for a specific high-temperature range sits at 0%[1]. Analysts note that thin trading volumes mean a single forecast update could drastically shift odds, echoing the 22-point surge seen on June 22[8].

Historically, Hong Kong’s June highs have hovered between 31°C and 35°C, with recent days like June 20 locking in at 31°C with 95.5% confidence[3]. The Observatory’s warnings for Thursday and Friday suggest temperatures in the New Territories could reach 37°C, reinforcing the likelihood of a 33°C+ peak on June 23[9]. Traders should monitor the Observatory’s daily extract releases, which finalize the “Absolute Daily Max” data, as this is the sole resolution source[1]. A recent update from the Observatory confirms real-time readings are being tracked, with humidity at 77% and calm winds, conditions that often amplify heat retention[7]. The settlement window ends 2026-06-23T12:00:00Z, leaving little time for late adjustments once data is published[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 23? 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

Is this market available outside the US?

Best Prediction Markets 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets triggers a quick verification flow that finishes in minutes.

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.