Highest temperature in Hong Kong on July 23?

Platform comparison

Market context

Hong Kong’s hottest reading on 23 July will be taken from the Hong Kong Observatory’s final “Absolute Daily Max (deg. C)” for that date, and the market will settle into the temperature band that contains that published value. In simple terms, a **YES** share pays if the outcome falls inside the range named by that contract, while a **NO** share pays if it does not.

A current crowd-implied probability of **0% YES** usually means traders see the listed band as essentially impossible, often because the range is very narrow or the day’s likely maximum is expected to land elsewhere. For a weather market like this, that reading should be treated cautiously: the real-world outcome is a single verified observation, not a forecast average, and late-day heat, cloud cover, rain, or coastal winds can shift the final maximum enough to move it between adjacent bands.

The main catalysts to watch are the Observatory’s observing schedule and the release of the finalized Daily Extract, because this market cannot resolve until the official data for 23 July 2026 has been published. In practice, traders will be watching for the day’s peak temperature as conditions evolve through the afternoon, then checking the Observatory’s published extract once it appears; until then, the market remains tied to the official data source rather than live estimates.

Methodology

We track Highest temperature in Hong Kong on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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 Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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