Highest temperature in Hong Kong on August 20?

Platform comparison

Market context

The Hong Kong Observatory will record the highest daily temperature in Celsius on 20 August 2026, measured to one decimal place. This market settles on the published absolute daily maximum from the Observatory's official climate data, with the settlement window closing at midday on that date. The crowd currently assigns zero probability to any specific temperature range, suggesting either insufficient liquidity or genuine uncertainty about which bracket will contain the eventual reading.

August represents Hong Kong's peak summer season, with historical daily maxima typically ranging between 32°C and 35°C during this period. The Observatory's records from recent Augusts show considerable variation: temperatures have exceeded 34°C on roughly half of August days over the past decade, whilst readings below 32°C remain uncommon. Tropical cyclone activity or unusual monsoon patterns could shift outcomes materially, though such events remain probabilistically modest for any single day. The absence of crowd probability suggests traders may be awaiting clearer seasonal forecasts or waiting for comparable markets to establish reference points.

The Hong Kong Observatory publishes daily climate extracts with a lag of several days, meaning final settlement data will not be available until late August at earliest. Traders should monitor the Observatory's seasonal outlook updates and any tropical cyclone warnings issued by the Regional Specialized Meteorological Centre in the weeks preceding 20 August. The specific date falls within the tail end of Hong Kong's summer monsoon season, when atmospheric conditions typically favour sustained heat but remain subject to sudden disruption from passing weather systems.

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 Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

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.

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'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.

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.

Do I need to KYC for this market?

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

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.