Highest temperature in Hong Kong on August 20?

Platform comparison

Market context

The Hong Kong Observatory will record the highest temperature in Hong Kong on 20 August 2026, measured in degrees Celsius to one decimal place. This market resolves based on the "Absolute Daily Max" figure published in the Observatory's Daily Extract once data is finalised. The settlement window closes at midday UTC on that date, though resolution may be delayed pending official publication of the meteorological record.

August temperatures in Hong Kong cluster consistently in the 32–34°C range for daily maxima, with occasional spikes above 35°C during particularly intense heat episodes. Historical data shows that extreme heat days—those exceeding 36°C—occur roughly once every two to three years during summer months. The 0% implied probability suggests the market is pricing in a scenario where the highest temperature falls below the lowest available range option, which typically begins around 30–31°C. This framing leaves substantial room for typical August conditions to fall within standard ranges, making the current consensus heavily weighted toward mid-range outcomes rather than extremes.

Traders should monitor seasonal weather patterns emerging in late July and early August 2026, particularly the strength of the Pacific anticyclone and any tropical cyclone activity in the region. The Hong Kong Observatory issues monthly forecasts and seasonal outlooks that may signal whether August 2026 is tracking toward above-average or below-average heat. Real-time atmospheric conditions in the week preceding 20 August will be the primary catalyst for price movement, as short-range forecasting becomes increasingly reliable within five to seven days of the target date.

Methodology

This page reviews Highest temperature in Hong Kong on August 20? 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 Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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 Who Will Win 2026. 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.