Highest temperature in Hong Kong on August 12?

Platform comparison

Market context

Hong Kong's daily maximum temperature on 12 August 2026 will be recorded by the Observatory's official network and published in their Daily Extract dataset. The settlement hinges on a single data point: the absolute daily maximum in degrees Celsius to one decimal place. This is a straightforward factual resolution tied to instrumental measurement rather than interpretation, making it suitable for automated settlement workflows once the Observatory publishes its finalised daily climate summary.

August is Hong Kong's peak summer season, with historical daily maxima typically ranging between 32–34°C. The 0% crowd probability suggests either insufficient liquidity or market participants waiting for more granular temperature bands to emerge. Reviewing the Observatory's historical records for early-to-mid August across the past decade provides the baseline: most years see highs in the 33–34°C range, though occasional heat waves push readings toward 35°C. Traders building conditional orders or bot-based strategies should reference the Observatory's 30-year climate normals and recent seasonal anomaly patterns to calibrate realistic range expectations.

The key dependency is the publication schedule of the Observatory's Daily Extract. Data typically becomes available within 24–48 hours of the measurement date, though official finalisation may extend slightly beyond the settlement window close (12 August 12:00 UTC). Traders automating resolution monitoring should flag the Observatory's website directly rather than relying on third-party weather APIs, as the market explicitly requires their "Absolute Daily Max" figure. Tropical cyclone activity or unusual atmospheric patterns in early August 2026 would be the primary catalyst shifting temperature expectations; monitoring the Observatory's seasonal forecasts and typhoon advisories from late July onwards will signal material shifts in the underlying distribution.

Methodology

This page reviews Highest temperature in Hong Kong on August 12? 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 Polymarket Review UK, 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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.