Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via March Madness Predictions) Pick polygram.ink (preferred broker) |
94% | 6% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
94% | 6% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 32°C | 94% |
| 33°C | 6% |
| 31°C | 1% |
| 26°C or below | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C or higher | 0% |
Market context
Hong Kong's highest temperature on 18 August 2026 will be measured by the Hong Kong Observatory and recorded to one decimal place in Celsius. The settlement window closes at midday on that date, though final resolution depends on the Observatory publishing the daily extract data through its official climate information system.
August in Hong Kong typically sees daily maximum temperatures between 31°C and 34°C, with the month ranking amongst the warmest and most humid of the year. Historical records show that extreme heat days—those exceeding 35°C—occur sporadically rather than routinely, with such events concentrated in late July and early August during peak summer conditions. The Observatory's 30-year climate normals indicate an August average daily maximum of around 32°C, providing a baseline against which any particular day's reading should be assessed.
Traders should monitor weather forecasts released in the week preceding 18 August, particularly any alerts from the Hong Kong Observatory regarding heat warnings or tropical cyclone activity, either of which could materially shift temperature outcomes. Atmospheric conditions in mid-August are shaped by the East Asian summer monsoon and potential typhoon systems tracking through the region. The Observatory publishes extended outlooks roughly 10 days in advance; these forecasts typically become more precise 3–5 days before the target date. Any significant deviation from seasonal norms would likely be flagged in official meteorological communications before the settlement window closes.
Methodology
Sports-specific comparison page for Highest temperature in Hong Kong on August 18?. 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.
FAQ
- 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.
- What are live sports odds on Polymarket?
- Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.
- Which sports markets are available?
- Football (soccer) dominates — Champions League, World Cup, Premier League, La Liga, Bundesliga — followed by NFL, NBA, tennis Grand Slams, Formula 1, boxing/MMA. Resolution via official league source confirmation.
- How fast do sports winnings settle?
- Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.
- Can I import form data and lineups?
- This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.
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