Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
78% | 22% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
78% | 22% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 28°C | 78% |
| 27°C | 17% |
| 26°C | 8% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
On 17 August 2026, the Hong Kong Observatory will record the lowest temperature for that date in degrees Celsius. This market resolves to whichever temperature band contains that minimum reading, measured to one decimal place and published in the Observatory's Daily Extract once the day's meteorological data is finalised.
Hong Kong's August temperatures are constrained by the region's subtropical climate and monsoon patterns. Historical August minima typically range between 24°C and 27°C, with the Observatory's records showing little variation in daily lows during this peak summer month. The 0% crowd probability suggests traders expect the minimum to fall outside the lowest available band—likely reflecting confidence that August heat will prevent exceptionally cool overnight conditions. Comparable August dates from recent years provide the most reliable benchmark; the Observatory's climate archive shows consistent patterns across the past two decades, with extreme departures from the 25–26°C range rare during this season.
Traders should monitor the monsoon forecast issued by the Hong Kong Observatory in early August 2026, as shifts in wind patterns or tropical cyclone activity could alter overnight cooling. The settlement window closes at midday on 17 August, but final temperature data may not appear in the Daily Extract until several days later, delaying resolution. Any significant weather system affecting the region—including remnants of tropical storms or unusual pressure systems—would be the primary catalyst for movement away from the current consensus.
Methodology
Sports-specific comparison page for Lowest temperature in Hong Kong on August 17?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
UK Frequently Asked Questions
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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