Highest temperature in Hong Kong on August 8?

Platform comparison

Market context

Polymarket is pricing this Hong Kong temperature contract at **0% YES**, which means the market is effectively assigning no on-chain value to the outcome that the day’s maximum lands in the YES range. On Polymarket, traders are buying and selling **conditional tokens** against **USDC** on Polygon, so the price reflects the crowd’s live read on the Hong Kong Observatory’s eventual **absolute daily maximum** in Celsius once the Daily Extract is published.

For context, Hong Kong’s August heat can produce very high readings, but the Observatory’s own record for 8 August is **36.3°C**, set in 2015, and it has also reported hot 8 Augusts such as **34.4°C** in 2020.[2][8] Recent market behaviour on nearby Hong Kong temperature contracts has also shown the book can shift sharply around the day’s actual reading; for example, Polymarket’s 6 August 2026 market was still split across low-temperature bands before resolution, which is a reminder that these contracts are about the final Observatory print rather than general seasonal expectations.[18]

The key catalyst is the Hong Kong Observatory’s publication timing: this market cannot resolve until the **Daily Extract** for 8 August 2026 is posted, and the official reading is the **Absolute Daily Max (deg. C)** in one-decimal Celsius.[Market description] Traders are therefore watching the Observatory’s hourly readings, the midday heat peak, and whether any thunderstorm outflow or cloud cover suppresses the day’s maximum; at 3 a.m. HKT, the Observatory was already reporting **29°C** with high humidity, which shows a warm baseline but not the eventual high.[6] AccuWeather’s Hong Kong August forecast also points to high daytime temperatures around the upper 90s Fahrenheit on nearby dates, consistent with a potentially hot August setup, though only the Observatory’s final published maximum determines settlement.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 8? 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 Alternative UK, 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.

UK Frequently Asked Questions

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.