Highest temperature in Hong Kong on August 21?

Platform comparison

Market context

Hong Kong is heading into the closing hours before the market window ends, with the Hong Kong Observatory’s official reading at headquarters still the only figure that matters for settlement.[11] Recent weather has been dominated by exceptional heat: Hong Kong recorded 36.9C on 9 August, its hottest official temperature on record, and nearby districts went even higher, which shows the city can still deliver a sharp late-summer spike when subsiding air and clear skies line up.[3][6]

That history is the main reason the current 0% yes probability looks vulnerable if the day turns very hot again, but comparable August patterns also show how quickly humidity, showers, or a shift to onshore flow can cap the day’s peak below the upper-30s outcomes. The Observatory’s climatology pages make clear that the market resolves off the “Absolute Daily Max” in the Daily Extract, so the final published value, not an early afternoon reading, will decide the bin.[2][8]

For traders, the key catalysts are the Observatory’s own forecasts, any very hot weather warnings, and the day’s rain and thunderstorm timing, because those directly affect whether the maximum is set in the low-30s or pushed towards the higher brackets. The market itself notes that August 21 is only eligible once the Daily Extract is published, so settlement depends on when the Observatory finalises that file rather than the live forecast alone.[11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Highest temperature in Hong Kong on August 21?. 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 (US-focused) or Manifold (play-money).

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.

Can I bet on individual matches?

Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.

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.

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Yes. Polymarket has Premier League outcome markets (title winner, relegation, top scorer). For UK traders wanting GBP settlement and UKGC protection, Betfair Exchange and Smarkets offer Premier League futures and match markets. Betfair is the deepest liquidity venue for UK football exchange markets.