Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
73% | 27% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
73% | 27% | 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 |
|---|---|
| 30°C | 73% |
| 31°C | 25% |
| 32°C | 1% |
| 26°C or below | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C or higher | 0% |
Market context
Hong Kong has just come off a severe heat spike: the Observatory said the city recorded 36.9C on Sunday, the highest temperature at the station since records began in 1884, with some inland automatic stations reaching 39.8C. That reset the baseline for this market, because a new daily high on 14 August now needs to clear a very elevated recent reference point rather than an ordinary August level.[12][11]
The comparison set still argues for caution on the very top bands, even in an established hot season. The Observatory’s August climatology shows that the highest official readings can run well above 34C in extreme periods, with 2024 described as exceptionally hot and a daily maximum of 34.6C at the Observatory on 1 August 2024; by contrast, last year’s 14 August extract showed a maximum of 30.7C, illustrating how sharply outcomes can swing with cloud, showers and storms.[8][13] That history is why the market’s current 0% crowd-implied yes price is only meaningful if traders believe today will stay well below the recent record-setting regime.
For the next 24 hours, the key catalysts are the Observatory’s updated forecasts, the timing of afternoon convection, and whether rain bands or thunderstorms suppress the daytime peak before the daily maximum is fixed in the post-event extract. Public forecast pages from BBC Weather, Time and Date, AccuWeather and Weather Underground all show warm, humid conditions with showers or thunderstorms in Hong Kong today, which would usually cap the maximum compared with the weekend’s record heat, but the settlement source remains the Hong Kong Observatory’s final “Absolute Daily Max” in its daily extract, not a private forecast.[6][9][14][10][1]
Methodology
This page reviews Highest temperature in Hong Kong on August 14? 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 Prediction Today, which mirrors the Polymarket order book at 0% fees.
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.
UK Frequently Asked Questions
- 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 Prediction Today. 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.
- 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%.
Trade Highest temperature in Hong Kong on August 14? on Prediction Today
Live order book, 0% fees, USDC settlement in seconds.
Open live market →