Highest temperature in Hong Kong on August 13?

Platform comparison

Market context

Hong Kong's August weather will determine the daily maximum temperature recorded by the Observatory on 13 August 2026. The settlement window closes at midday UTC on that date, with resolution contingent on the Observatory publishing its "Absolute Daily Max" figure in the Daily Extract dataset. Temperature readings are recorded to one decimal place in Celsius, which will determine which range bracket the outcome falls into.

Hong Kong's August climate is characterised by high heat and humidity during the peak summer monsoon season. Historical data from the Observatory shows August daily maxima typically range between 31–34°C, with extremes occasionally reaching 35°C or above during heat waves. The 0% crowd probability suggests traders are either awaiting range options to be specified or treating this as a placeholder market pending clarification on the specific temperature brackets available for settlement.

Traders monitoring this contract should track the Hong Kong Observatory's seasonal forecasts and any tropical cyclone activity in the Western Pacific, which can significantly alter temperature patterns in early-to-mid August. The Observatory publishes monthly climate summaries and daily weather bulletins; any unusual atmospheric patterns or heat dome formation in late July would signal material shifts in expected August temperatures. Settlement depends entirely on official Observatory data publication, which typically occurs within days of the observation date, making this a straightforward real-world data resolution once the window closes.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

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%.