Highest temperature in Hong Kong on July 8?

Platform comparison

Market context

On 8 July 2026, Hong Kong faces a day of intense heat as the subtropical ridge weakens slightly but remains dominant over southern China, with temperatures forecast to range from 29°C to 34°C across the city. The Hong Kong Observatory has confirmed that the mercury is set to climb between 28°C and 33°C from 8 to 13 July before rising again to 29°C–34°C on 14 July, suggesting that a peak near 34°C is plausible for the settlement date. This real-world backdrop frames the current prediction-market implied probability of 0% YES for any specific high-temperature range, which appears to diverge sharply from both historical patterns and analyst expectations.

Historically, July in Hong Kong is one of the hottest months, with the average high reaching 30.1°C and record peaks often exceeding 34°C; in 2026, the Observatory has already flagged the year as potentially one of the hottest on record, with recent data showing a peak of 34.8°C earlier this year. Comparable cases from past years show that daily highs frequently land in the 33°C–35°C band, making a 0% implied probability for any range above 32°C highly anomalous when compared to sportsbook lines on similar weather contracts, which typically assign meaningful odds to the 33°C+ range. This divergence suggests a potential mispricing in the prediction market relative to the consensus view among climate analysts.

Traders should monitor the Hong Kong Observatory’s daily extract for the “Absolute Daily Max (deg. C)” once finalized, as the market cannot resolve until this data is published. Key catalysts include the subtropical ridge’s behaviour and any tropical cyclone activity, which could suppress temperatures unexpectedly. The Observatory’s latest forecast, released on 7 July, notes that temperatures will remain very hot over the coast of southern China, reinforcing the likelihood of a high near 34°C. A recent report from The Straits Times confirms that the city is expected to see highs of 29°C–34°C on 8 July, aligning with the historical trend and contradicting the current 0% market implied probability[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 8? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi vs Polymarket, which mirrors the Polymarket order book at 0% fees.

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 Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.