Highest temperature in Hong Kong on July 5?

Platform comparison

Market context

On 5 July 2026, Hong Kong will face its peak summer heat, with the Hong Kong Observatory set to record the absolute daily maximum temperature in degrees Celsius. The current crowd-implied probability for a YES outcome—meaning the temperature exceeds a specific threshold—is 0%, suggesting the market consensus expects a notably cool day or a data anomaly. Yet historically, July is Hong Kong’s hottest month, with mean maximum temperatures around 31.8°C and frequent readings above 30°C, as seen in July 2018 and July 2025, when peaks reached 34.3°C[1][7]. This stark contrast between historical norms and the current 0% probability creates a compelling underdog scenario for contrarian traders.

The key catalysts to watch include the release of the Observatory’s “Daily Extract” data, which finalises the “Absolute Daily Max” figure, and any unexpected weather disruptions such as tropical cyclones or heavy monsoon rains that could suppress temperatures. Recent forecasts for July 2026 indicate daily highs ranging from 87°F to 95°F (30.6°C to 35°C), reinforcing the likelihood of a hot day unless a rare cooling event intervenes[5]. With no major weather alerts currently issued, the value spot may lie in betting against the 0% consensus, particularly if the market has overreacted to short-term cloud cover or unverified local reports. Traders should monitor the Observatory’s climatological updates closely, as the final resolution hinges entirely on this official dataset[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on July 5? 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 Who Will Win 2026. 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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.