Highest temperature in Hong Kong on August 20?

Platform comparison

Market context

On 20 August 2026, the Hong Kong Observatory will record the day's highest temperature in Celsius to one decimal place, with this market resolving to whichever temperature band contains that reading. The settlement window closes at midday UTC on that date, though final resolution depends on the Observatory publishing its daily extract data, which typically occurs within days of observation.

Hong Kong's August temperatures cluster reliably between 28°C and 34°C, with the historical August average daily maximum around 31–32°C. The territory's record August high stands at 36.3°C, set in 1990, though such extremes remain statistical outliers. Recent Augusts have seen daily maxima predominantly in the 30–33°C range, with occasional spikes above 34°C during heat waves driven by Pacific anticyclones or tropical systems. The current 0% implied probability across prediction markets suggests traders view the market as either incomplete or awaiting price discovery, rather than reflecting genuine consensus that August 20 will fall outside typical ranges.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone activity in the Western Pacific during mid-August 2026, as these systems can either suppress temperatures through cloud cover or elevate them through pre-storm heating. The Observatory publishes monthly climate summaries and daily weather bulletins that provide early signals for temperature extremes. Cross-platform comparison shows no meaningful divergence in odds yet, likely because the market lacks sufficient trading volume to establish consensus pricing across different platforms.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.